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    <link:label id="lab_altri_LucroPrejuizoDeOperacoesDescontinuadasAtribuivelAParticipacoesNaoControladoras_label_pt" xlink:label="lab_altri_LucroPrejuizoDeOperacoesDescontinuadasAtribuivelAParticipacoesNaoControladoras" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Lucro (Prejuizo) de Operacoes Descontinuadas, Atribuivel a Participacoes Nao Controladoras</link:label>
    <link:label id="lab_altri_LucroPrejuizoDeOperacoesDescontinuadasAtribuivelAParticipacoesNaoControladoras_documentation_pt" xlink:label="lab_altri_LucroPrejuizoDeOperacoesDescontinuadasAtribuivelAParticipacoesNaoControladoras" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Lucro (Prejuizo) de Operacoes Descontinuadas, Atribuivel a Participacoes Nao Controladoras</link:label>
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    <link:label id="lab_altri_ResultadosAntesDeImpostosECeseDasOperacoesContinuadas_documentation_pt" xlink:label="lab_altri_ResultadosAntesDeImpostosECeseDasOperacoesContinuadas" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Resultados Antes De Impostos E Cese Das Operacoes Continuadas</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Assets" xlink:to="lab_ifrs-full_Assets" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_OutrasReservasIncluindoLucrosRetidos_label_pt" xlink:label="lab_altri_OutrasReservasIncluindoLucrosRetidos" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Outras Reservas, Incluindo Lucros Retidos</link:label>
    <link:label id="lab_altri_OutrasReservasIncluindoLucrosRetidos_documentation_pt" xlink:label="lab_altri_OutrasReservasIncluindoLucrosRetidos" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Outras Reservas, Incluindo Lucros Retidos</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_OutrasReservasIncluindoLucrosRetidos" xlink:href="051988-2021-12-31.xsd#altri_OutrasReservasIncluindoLucrosRetidos"/>
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    <link:label id="lab_altri_LucroPrejuizoDeOperacoesContinuadasAtribuivelADetentoresDeCapitalProprioDaEmpresaMae_label_pt" xlink:label="lab_altri_LucroPrejuizoDeOperacoesContinuadasAtribuivelADetentoresDeCapitalProprioDaEmpresaMae" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Lucro (Prejuizo) de Operacoes Continuadas, Atribuivel A Detentores De Capital Proprio Da Empresa Mae</link:label>
    <link:label id="lab_altri_LucroPrejuizoDeOperacoesContinuadasAtribuivelADetentoresDeCapitalProprioDaEmpresaMae_documentation_pt" xlink:label="lab_altri_LucroPrejuizoDeOperacoesContinuadasAtribuivelADetentoresDeCapitalProprioDaEmpresaMae" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Lucro (Prejuizo) de Operacoes Continuadas, Atribuivel A Detentores De Capital Proprio Da Empresa Mae</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_LucroPrejuizoDeOperacoesContinuadasAtribuivelADetentoresDeCapitalProprioDaEmpresaMae" xlink:href="051988-2021-12-31.xsd#altri_LucroPrejuizoDeOperacoesContinuadasAtribuivelADetentoresDeCapitalProprioDaEmpresaMae"/>
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    <link:label id="lab_altri_VariacaoDePerimetro_documentation_pt" xlink:label="lab_altri_VariacaoDePerimetro" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Variacao De Perimetro</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_VariacaoDePerimetro" xlink:href="051988-2021-12-31.xsd#altri_VariacaoDePerimetro"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_VariacaoDePerimetro" xlink:to="lab_altri_VariacaoDePerimetro" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_PagamentosDeAtividadesDeFinanciamento_d22d5197-d499-4fb0-8d4e-af2a547d0608_totalLabel_pt" xlink:label="lab_altri_PagamentosDeAtividadesDeFinanciamento" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Pagamentos de atividades de financiamento</link:label>
    <link:label id="lab_altri_PagamentosDeAtividadesDeFinanciamento_label_pt" xlink:label="lab_altri_PagamentosDeAtividadesDeFinanciamento" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Pagamentos de atividades de financiamento</link:label>
    <link:label id="lab_altri_PagamentosDeAtividadesDeFinanciamento_documentation_pt" xlink:label="lab_altri_PagamentosDeAtividadesDeFinanciamento" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">As saídas de caixa referentes a atividades de financiamento.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_PagamentosDeAtividadesDeFinanciamento" xlink:href="051988-2021-12-31.xsd#altri_PagamentosDeAtividadesDeFinanciamento"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_PagamentosDeAtividadesDeFinanciamento" xlink:to="lab_altri_PagamentosDeAtividadesDeFinanciamento" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentLiabilities_eb9675d8-ff27-4476-926f-726af297655e_totalLabel_pt" xlink:label="lab_ifrs-full_NoncurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Passivos não correntes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentLiabilities" xlink:to="lab_ifrs-full_NoncurrentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_RecebimentosProvenientesDeEmprestimosDeAcionistas_label_pt" xlink:label="lab_altri_RecebimentosProvenientesDeEmprestimosDeAcionistas" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Recebimentos Provenientes De Emprestimos De Acionistas</link:label>
    <link:label id="lab_altri_RecebimentosProvenientesDeEmprestimosDeAcionistas_documentation_pt" xlink:label="lab_altri_RecebimentosProvenientesDeEmprestimosDeAcionistas" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Recebimentos provenientes de empréstimos de acionistas.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_RecebimentosProvenientesDeEmprestimosDeAcionistas" xlink:href="051988-2021-12-31.xsd#altri_RecebimentosProvenientesDeEmprestimosDeAcionistas"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_RecebimentosProvenientesDeEmprestimosDeAcionistas" xlink:to="lab_altri_RecebimentosProvenientesDeEmprestimosDeAcionistas" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_InflowsOfCashFromInvestingActivities_2331d591-b4d6-4e8f-abae-4b34c6801475_totalLabel_pt" xlink:label="lab_ifrs-full_InflowsOfCashFromInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Entradas de caixa das atividades de investimento</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InflowsOfCashFromInvestingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_InflowsOfCashFromInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_InflowsOfCashFromInvestingActivities" xlink:to="lab_ifrs-full_InflowsOfCashFromInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_OutrosPassivosCorrentes_label_pt" xlink:label="lab_altri_OutrosPassivosCorrentes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Outros passivos correntes</link:label>
    <link:label id="lab_altri_OutrosPassivosCorrentes_documentation_pt" xlink:label="lab_altri_OutrosPassivosCorrentes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">A quantia de outros passivos correntes, correspondentes a encargos a liquidar e subsídios ao investimento reconhecidos como rendimento diferido.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_OutrosPassivosCorrentes" xlink:href="051988-2021-12-31.xsd#altri_OutrosPassivosCorrentes"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_OutrosPassivosCorrentes" xlink:to="lab_altri_OutrosPassivosCorrentes" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_ResultadoLiquidoConsolidadoDoExercicio_label_pt" xlink:label="lab_altri_ResultadoLiquidoConsolidadoDoExercicio" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Resultado Liquido Consolidado Do Exercicio</link:label>
    <link:label id="lab_altri_ResultadoLiquidoConsolidadoDoExercicio_documentation_pt" xlink:label="lab_altri_ResultadoLiquidoConsolidadoDoExercicio" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Uma componente do capital próprio que representa o défice ou os lucros acumulados não distribuídos da entidade, respeitantes ao exercício.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_ResultadoLiquidoConsolidadoDoExercicio" xlink:href="051988-2021-12-31.xsd#altri_ResultadoLiquidoConsolidadoDoExercicio"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_ResultadoLiquidoConsolidadoDoExercicio" xlink:to="lab_altri_ResultadoLiquidoConsolidadoDoExercicio" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_PagamentosDeIncentivosReembolsaveis_label_pt" xlink:label="lab_altri_PagamentosDeIncentivosReembolsaveis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Pagamentos De Incentivos Reembolsaveis</link:label>
    <link:label id="lab_altri_PagamentosDeIncentivosReembolsaveis_documentation_pt" xlink:label="lab_altri_PagamentosDeIncentivosReembolsaveis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">As saídas de caixa, classificadas como atividades de financiamento, referentes a pagamentos de incentivos reembolsáveis.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_PagamentosDeIncentivosReembolsaveis" xlink:href="051988-2021-12-31.xsd#altri_PagamentosDeIncentivosReembolsaveis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_PagamentosDeIncentivosReembolsaveis" xlink:to="lab_altri_PagamentosDeIncentivosReembolsaveis" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_PagamentosDeOutrasOperacoesDeFinanciamento_label_pt" xlink:label="lab_altri_PagamentosDeOutrasOperacoesDeFinanciamento" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Pagamentos De Outras Operacoes De Financiamento</link:label>
    <link:label id="lab_altri_PagamentosDeOutrasOperacoesDeFinanciamento_documentation_pt" xlink:label="lab_altri_PagamentosDeOutrasOperacoesDeFinanciamento" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">As saídas de caixa, classificadas como atividades de financiamento, referentes a pagamentos de outras operações de financiamento.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_PagamentosDeOutrasOperacoesDeFinanciamento" xlink:href="051988-2021-12-31.xsd#altri_PagamentosDeOutrasOperacoesDeFinanciamento"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_PagamentosDeOutrasOperacoesDeFinanciamento" xlink:to="lab_altri_PagamentosDeOutrasOperacoesDeFinanciamento" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_PagamentosRespeitantesAEmprestimosDeAcionistas_label_pt" xlink:label="lab_altri_PagamentosRespeitantesAEmprestimosDeAcionistas" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Pagamentos Respeitantes A Emprestimos De Acionistas</link:label>
    <link:label id="lab_altri_PagamentosRespeitantesAEmprestimosDeAcionistas_documentation_pt" xlink:label="lab_altri_PagamentosRespeitantesAEmprestimosDeAcionistas" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Pagamentos Respeitantes A Emprestimos De Acionistas</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_PagamentosRespeitantesAEmprestimosDeAcionistas" xlink:href="051988-2021-12-31.xsd#altri_PagamentosRespeitantesAEmprestimosDeAcionistas"/>
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    <link:label id="lab_altri_VariacaoDePercentagemEmFiliais_documentation_pt" xlink:label="lab_altri_VariacaoDePercentagemEmFiliais" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Variacao De Percentagem Em Filiais</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_VariacaoDePercentagemEmFiliais" xlink:href="051988-2021-12-31.xsd#altri_VariacaoDePercentagemEmFiliais"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_VariacaoDePercentagemEmFiliais" xlink:to="lab_altri_VariacaoDePercentagemEmFiliais" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_EmprestimosBancariosCorrentes_label_pt" xlink:label="lab_altri_EmprestimosBancariosCorrentes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Emprestimos Bancarios Correntes</link:label>
    <link:label id="lab_altri_EmprestimosBancariosCorrentes_documentation_pt" xlink:label="lab_altri_EmprestimosBancariosCorrentes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">A quantia dos empréstimos bancários correntes e da parte corrente dos empréstimos bancários não correntes.</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_EmprestimosBancariosCorrentes" xlink:to="lab_altri_EmprestimosBancariosCorrentes" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentLiabilities_251fec5c-290e-4abc-b2de-07f7111d56ad_totalLabel_pt" xlink:label="lab_ifrs-full_CurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Passivos correntes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentLiabilities" xlink:to="lab_ifrs-full_CurrentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentAssets_2f2bc19a-3e88-4488-b14d-0187dbf03d17_totalLabel_pt" xlink:label="lab_ifrs-full_NoncurrentAssets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Ativos não correntes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentAssets" xlink:to="lab_ifrs-full_NoncurrentAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProfitLossFromContinuingOperations_a4cc6d16-a9a7-42cd-856d-c80399250619_totalLabel_pt" xlink:label="lab_ifrs-full_ProfitLossFromContinuingOperations" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Lucros (perdas) de unidades operacionais em continuação</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossFromContinuingOperations" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossFromContinuingOperations"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProfitLossFromContinuingOperations" xlink:to="lab_ifrs-full_ProfitLossFromContinuingOperations" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_MontantesEmOutroRendimentoIntegralEAcumuladoEmCapitalProprioRelacionadoComGrupoDeAtivosClassificadosComoDetidosParaDistribuicaoAosAcionistasMember_label_pt" xlink:label="lab_altri_MontantesEmOutroRendimentoIntegralEAcumuladoEmCapitalProprioRelacionadoComGrupoDeAtivosClassificadosComoDetidosParaDistribuicaoAosAcionistasMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Montantes Em Outro Rendimento Integral E Acumulado Em Capital Proprio Relacionado Com Grupo De Ativos Classificados Como Detidos Para Distribuicao Aos Acionistas [Member]</link:label>
    <link:label id="lab_altri_MontantesEmOutroRendimentoIntegralEAcumuladoEmCapitalProprioRelacionadoComGrupoDeAtivosClassificadosComoDetidosParaDistribuicaoAosAcionistasMember_documentation_pt" xlink:label="lab_altri_MontantesEmOutroRendimentoIntegralEAcumuladoEmCapitalProprioRelacionadoComGrupoDeAtivosClassificadosComoDetidosParaDistribuicaoAosAcionistasMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Montantes Em Outro Rendimento Integral E Acumulado Em Capital Proprio Relacionado Com Grupo De Ativos Classificados Como Detidos Para Distribuicao Aos Acionistas</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_MontantesEmOutroRendimentoIntegralEAcumuladoEmCapitalProprioRelacionadoComGrupoDeAtivosClassificadosComoDetidosParaDistribuicaoAosAcionistasMember" xlink:href="051988-2021-12-31.xsd#altri_MontantesEmOutroRendimentoIntegralEAcumuladoEmCapitalProprioRelacionadoComGrupoDeAtivosClassificadosComoDetidosParaDistribuicaoAosAcionistasMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_MontantesEmOutroRendimentoIntegralEAcumuladoEmCapitalProprioRelacionadoComGrupoDeAtivosClassificadosComoDetidosParaDistribuicaoAosAcionistasMember" xlink:to="lab_altri_MontantesEmOutroRendimentoIntegralEAcumuladoEmCapitalProprioRelacionadoComGrupoDeAtivosClassificadosComoDetidosParaDistribuicaoAosAcionistasMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax_38bb697c-dca6-4dec-abb0-45834dafa0db_totalLabel_pt" xlink:label="lab_ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Outro rendimento integral que será reclassificado nos resultados, líquido de impostos</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:to="lab_ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_LiquidacaoDeEmpresas_label_pt" xlink:label="lab_altri_LiquidacaoDeEmpresas" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Liquidacao De Empresas</link:label>
    <link:label id="lab_altri_LiquidacaoDeEmpresas_documentation_pt" xlink:label="lab_altri_LiquidacaoDeEmpresas" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Liquidação de empresas subsidiárias.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_LiquidacaoDeEmpresas" xlink:href="051988-2021-12-31.xsd#altri_LiquidacaoDeEmpresas"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_LiquidacaoDeEmpresas" xlink:to="lab_altri_LiquidacaoDeEmpresas" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityAttributableToOwnersOfParent_d4f43a20-e95a-4bc0-8966-360f9d32756e_totalLabel_pt" xlink:label="lab_ifrs-full_EquityAttributableToOwnersOfParent" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Capital próprio atribuível aos proprietários da entidade-mãe</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParent" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAttributableToOwnersOfParent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParent" xlink:to="lab_ifrs-full_EquityAttributableToOwnersOfParent" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_62bc702a-5647-4992-a449-1f0cdb316724_periodStartLabel_pt" xlink:label="lab_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Caixa e equivalentes de caixa se diferentes da demonstração da posição financeira no início do período</link:label>
    <link:label id="lab_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_e2aa1650-279a-4176-a9fa-ac2f7aa58045_periodEndLabel_pt" xlink:label="lab_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Caixa e equivalentes de caixa se diferentes da demonstração da posição financeira no final de período</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" xlink:to="lab_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_PagamentosDeSubsidiosAoInvestimento_label_pt" xlink:label="lab_altri_PagamentosDeSubsidiosAoInvestimento" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Pagamentos De Subsidios Ao Investimento</link:label>
    <link:label id="lab_altri_PagamentosDeSubsidiosAoInvestimento_documentation_pt" xlink:label="lab_altri_PagamentosDeSubsidiosAoInvestimento" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">As saídas de caixa, classificadas como atividades de investimento, referentes a pagamentos de subsídios ao investimento.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_PagamentosDeSubsidiosAoInvestimento" xlink:href="051988-2021-12-31.xsd#altri_PagamentosDeSubsidiosAoInvestimento"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_PagamentosDeSubsidiosAoInvestimento" xlink:to="lab_altri_PagamentosDeSubsidiosAoInvestimento" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_IncentivosReembolsaveisNaoCorrentes_label_pt" xlink:label="lab_altri_IncentivosReembolsaveisNaoCorrentes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Incentivos Reembolsaveis Nao Correntes</link:label>
    <link:label id="lab_altri_IncentivosReembolsaveisNaoCorrentes_documentation_pt" xlink:label="lab_altri_IncentivosReembolsaveisNaoCorrentes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">A quantia de incentivos reembolsáveis não correntes.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_IncentivosReembolsaveisNaoCorrentes" xlink:href="051988-2021-12-31.xsd#altri_IncentivosReembolsaveisNaoCorrentes"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_IncentivosReembolsaveisNaoCorrentes" xlink:to="lab_altri_IncentivosReembolsaveisNaoCorrentes" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ComprehensiveIncome_872a00d3-6599-459e-b84a-64759463e54e_totalLabel_pt" xlink:label="lab_ifrs-full_ComprehensiveIncome" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Rendimento integral</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComprehensiveIncome" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ComprehensiveIncome" xlink:to="lab_ifrs-full_ComprehensiveIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_Equity_e41b14f1-fa63-4100-ac22-f29a5a67a3eb_totalLabel_pt" xlink:label="lab_ifrs-full_Equity" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Total equity</link:label>
    <link:label id="lab_ifrs-full_Equity_23fd716c-ea78-4066-96bd-806c691569a9_periodStartLabel_pt" xlink:label="lab_ifrs-full_Equity" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Equity at beginning of period</link:label>
    <link:label id="lab_ifrs-full_Equity_ec51e97b-f25e-454a-87a0-c9f310e46107_periodEndLabel_pt" xlink:label="lab_ifrs-full_Equity" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Equity at end of period</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Equity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Equity" xlink:to="lab_ifrs-full_Equity" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax_c834e376-ead3-4926-a402-4616c6183214_totalLabel_pt" xlink:label="lab_ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Outro rendimento integral que não será reclassificado nos resultados, líquido de impostos</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:to="lab_ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_LucroPrejuizoDeOperacoesContinuadasAtribuivelAParticipacoesNaoControladoras_label_pt" xlink:label="lab_altri_LucroPrejuizoDeOperacoesContinuadasAtribuivelAParticipacoesNaoControladoras" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Lucro (Prejuizo) de Operacoes Continuadas, Atribuivel a Participacoes Nao Controladoras</link:label>
    <link:label id="lab_altri_LucroPrejuizoDeOperacoesContinuadasAtribuivelAParticipacoesNaoControladoras_documentation_pt" xlink:label="lab_altri_LucroPrejuizoDeOperacoesContinuadasAtribuivelAParticipacoesNaoControladoras" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Lucro (Prejuizo) de Operacoes Continuadas, Atribuivel a Participacoes Nao Controladoras</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_LucroPrejuizoDeOperacoesContinuadasAtribuivelAParticipacoesNaoControladoras" xlink:href="051988-2021-12-31.xsd#altri_LucroPrejuizoDeOperacoesContinuadasAtribuivelAParticipacoesNaoControladoras"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_LucroPrejuizoDeOperacoesContinuadasAtribuivelAParticipacoesNaoControladoras" xlink:to="lab_altri_LucroPrejuizoDeOperacoesContinuadasAtribuivelAParticipacoesNaoControladoras" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_LucroPrejuizoDeOperacoesDescontinuadasAtribuivelADetentoresDeCapitalProprioDaEmpresaMae_label_pt" xlink:label="lab_altri_LucroPrejuizoDeOperacoesDescontinuadasAtribuivelADetentoresDeCapitalProprioDaEmpresaMae" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Lucro (Prejuizo) de Operacoes Descontinuadas, Atribuivel A Detentores De Capital Proprio Da Empresa Mae</link:label>
    <link:label id="lab_altri_LucroPrejuizoDeOperacoesDescontinuadasAtribuivelADetentoresDeCapitalProprioDaEmpresaMae_documentation_pt" xlink:label="lab_altri_LucroPrejuizoDeOperacoesDescontinuadasAtribuivelADetentoresDeCapitalProprioDaEmpresaMae" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Lucro (Prejuizo) de Operacoes Descontinuadas, Atribuivel A Detentores De Capital Proprio Da Empresa Mae</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_LucroPrejuizoDeOperacoesDescontinuadasAtribuivelADetentoresDeCapitalProprioDaEmpresaMae" xlink:href="051988-2021-12-31.xsd#altri_LucroPrejuizoDeOperacoesDescontinuadasAtribuivelADetentoresDeCapitalProprioDaEmpresaMae"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_LucroPrejuizoDeOperacoesDescontinuadasAtribuivelADetentoresDeCapitalProprioDaEmpresaMae" xlink:to="lab_altri_LucroPrejuizoDeOperacoesDescontinuadasAtribuivelADetentoresDeCapitalProprioDaEmpresaMae" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities_b00d3219-0e97-4698-bfd5-b3c96d68089c_totalLabel_pt" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Fluxos de caixa de (utilizados em) atividades de investimento</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentAssets_d8d2ca1d-2c9a-4aa9-a109-90e19a886360_totalLabel_pt" xlink:label="lab_ifrs-full_CurrentAssets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Ativos correntes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentAssets" xlink:to="lab_ifrs-full_CurrentAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_DetidosParaDistribuicaoAosAcionistas_label_pt" xlink:label="lab_altri_DetidosParaDistribuicaoAosAcionistas" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Detidos Para Distribuicao Aos Acionistas</link:label>
    <link:label id="lab_altri_DetidosParaDistribuicaoAosAcionistas_documentation_pt" xlink:label="lab_altri_DetidosParaDistribuicaoAosAcionistas" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Detidos Para Distribuicao Aos Acionistas</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_DetidosParaDistribuicaoAosAcionistas" xlink:href="051988-2021-12-31.xsd#altri_DetidosParaDistribuicaoAosAcionistas"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_DetidosParaDistribuicaoAosAcionistas" xlink:to="lab_altri_DetidosParaDistribuicaoAosAcionistas" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProfitLoss_b181312b-c000-49a6-ab85-26d9655d41ef_totalLabel_pt" xlink:label="lab_ifrs-full_ProfitLoss" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Lucros (perdas)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLoss" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLoss"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProfitLoss" xlink:to="lab_ifrs-full_ProfitLoss" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges_a2d702f1-3bda-454d-9b9d-41a68801dd28_totalLabel_pt" xlink:label="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Aumento (diminuição) de caixa e equivalentes de caixa antes do efeito das variações das taxas de câmbio</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges" xlink:to="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherComprehensiveIncome_4be1fd10-ff2a-4ee4-86ac-30684674e658_totalLabel_pt" xlink:label="lab_ifrs-full_OtherComprehensiveIncome" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Outro rendimento integral</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncome" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherComprehensiveIncome" xlink:to="lab_ifrs-full_OtherComprehensiveIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_RecebimentosDeAtividadesDeFinanciamento_c495197b-6ddc-4ae1-9ab3-36a74eee3dc2_totalLabel_pt" xlink:label="lab_altri_RecebimentosDeAtividadesDeFinanciamento" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Recebimentos de atividades de financiamento</link:label>
    <link:label id="lab_altri_RecebimentosDeAtividadesDeFinanciamento_label_pt" xlink:label="lab_altri_RecebimentosDeAtividadesDeFinanciamento" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Recebimentos De Atividades De Financiamento</link:label>
    <link:label id="lab_altri_RecebimentosDeAtividadesDeFinanciamento_documentation_pt" xlink:label="lab_altri_RecebimentosDeAtividadesDeFinanciamento" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">As entradas de caixa, classificadas como atividades de financiamento.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_RecebimentosDeAtividadesDeFinanciamento" xlink:href="051988-2021-12-31.xsd#altri_RecebimentosDeAtividadesDeFinanciamento"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_RecebimentosDeAtividadesDeFinanciamento" xlink:to="lab_altri_RecebimentosDeAtividadesDeFinanciamento" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities_a31524f3-c66c-43e7-8a2d-30cc9e456218_totalLabel_pt" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Fluxos de caixa de (utilizados em) atividades de financiamento</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_EmprestimosBancariosNaoCorrentes_label_pt" xlink:label="lab_altri_EmprestimosBancariosNaoCorrentes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Emprestimos Bancarios Nao Correntes</link:label>
    <link:label id="lab_altri_EmprestimosBancariosNaoCorrentes_documentation_pt" xlink:label="lab_altri_EmprestimosBancariosNaoCorrentes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">A parte não corrente dos empréstimos bancários não correntes.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_EmprestimosBancariosNaoCorrentes" xlink:href="051988-2021-12-31.xsd#altri_EmprestimosBancariosNaoCorrentes"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_EmprestimosBancariosNaoCorrentes" xlink:to="lab_altri_EmprestimosBancariosNaoCorrentes" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_ProvisoesEPerdasPorImparidade_label_pt" xlink:label="lab_altri_ProvisoesEPerdasPorImparidade" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Provisoes E Perdas Por Imparidade</link:label>
    <link:label id="lab_altri_ProvisoesEPerdasPorImparidade_documentation_pt" xlink:label="lab_altri_ProvisoesEPerdasPorImparidade" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">A quantia de reforços e reversões do exercício, de provisões e perdas por imparidade.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_ProvisoesEPerdasPorImparidade" xlink:href="051988-2021-12-31.xsd#altri_ProvisoesEPerdasPorImparidade"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_ProvisoesEPerdasPorImparidade" xlink:to="lab_altri_ProvisoesEPerdasPorImparidade" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_IncentivosReembolsaveisCorrentes_label_pt" xlink:label="lab_altri_IncentivosReembolsaveisCorrentes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Incentivos Reembolsaveis Correntes</link:label>
    <link:label id="lab_altri_IncentivosReembolsaveisCorrentes_documentation_pt" xlink:label="lab_altri_IncentivosReembolsaveisCorrentes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">A quantia dos incentivos reembolsáveis correntes.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_IncentivosReembolsaveisCorrentes" xlink:href="051988-2021-12-31.xsd#altri_IncentivosReembolsaveisCorrentes"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_IncentivosReembolsaveisCorrentes" xlink:to="lab_altri_IncentivosReembolsaveisCorrentes" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OutflowsOfCashFromInvestingActivities_f6d7c5f9-378d-4e24-93d7-3036b1f5ca28_totalLabel_pt" xlink:label="lab_ifrs-full_OutflowsOfCashFromInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Saídas de caixa de atividades de investimento</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OutflowsOfCashFromInvestingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OutflowsOfCashFromInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OutflowsOfCashFromInvestingActivities" xlink:to="lab_ifrs-full_OutflowsOfCashFromInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_ResultadoLiquidoMember_label_pt" xlink:label="lab_altri_ResultadoLiquidoMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Resultado Liquido [Member]</link:label>
    <link:label id="lab_altri_ResultadoLiquidoMember_documentation_pt" xlink:label="lab_altri_ResultadoLiquidoMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Este membro representa uma componente do capital próprio que representa o défice ou os lucros do exercício, não distribuídos de uma entidade.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_ResultadoLiquidoMember" xlink:href="051988-2021-12-31.xsd#altri_ResultadoLiquidoMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_ResultadoLiquidoMember" xlink:to="lab_altri_ResultadoLiquidoMember" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_RecebimentosDeOutrasOperacoesDeFinanciamento_label_pt" xlink:label="lab_altri_RecebimentosDeOutrasOperacoesDeFinanciamento" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Recebimentos De Outras Operacoes De Financiamento</link:label>
    <link:label id="lab_altri_RecebimentosDeOutrasOperacoesDeFinanciamento_documentation_pt" xlink:label="lab_altri_RecebimentosDeOutrasOperacoesDeFinanciamento" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">As entradas de caixa, classificadas como atividades de financiamento, referentes a recebimentos de outras operações de financiamento.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_RecebimentosDeOutrasOperacoesDeFinanciamento" xlink:href="051988-2021-12-31.xsd#altri_RecebimentosDeOutrasOperacoesDeFinanciamento"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_RecebimentosDeOutrasOperacoesDeFinanciamento" xlink:to="lab_altri_RecebimentosDeOutrasOperacoesDeFinanciamento" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities_831f9101-807e-4461-b209-588f0b70eb20_totalLabel_pt" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Fluxos de caixa de (utilizados em) atividades de exploração</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_altri_ContribuicaoExtraordinariaSobreOSetorEnergeticoCese_label_pt" xlink:label="lab_altri_ContribuicaoExtraordinariaSobreOSetorEnergeticoCese" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Contribuicao Extraordinaria Sobre O Setor Energetico (Cese)</link:label>
    <link:label id="lab_altri_ContribuicaoExtraordinariaSobreOSetorEnergeticoCese_documentation_pt" xlink:label="lab_altri_ContribuicaoExtraordinariaSobreOSetorEnergeticoCese" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Contribuicao Extraordinaria Sobre O Setor Energetico (Cese)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_altri_ContribuicaoExtraordinariaSobreOSetorEnergeticoCese" xlink:href="051988-2021-12-31.xsd#altri_ContribuicaoExtraordinariaSobreOSetorEnergeticoCese"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_altri_ContribuicaoExtraordinariaSobreOSetorEnergeticoCese" xlink:to="lab_altri_ContribuicaoExtraordinariaSobreOSetorEnergeticoCese" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityAndLiabilities_21932c6f-e2fe-48a9-a842-8a426f5d2a98_totalLabel_pt" xlink:label="lab_ifrs-full_EquityAndLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="pt">Capital próprio e passivos</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAndLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAndLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EquityAndLiabilities" xlink:to="lab_ifrs-full_EquityAndLiabilities" xlink:type="arc" order="1"/>
  </link:labelLink>
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