Decreto-Lei n. 519-C/79 de 29/12/1979. Estabelece o regime jurídico das relações colectivas de trabalho. Diário da República I Série n. 299 de 29/12/1979 Página 3446-(49)

This decree-law establishes the legal framework governing collective labor relations in Portugal. It defines the rules for negotiations and agreements between employers and workers' representatives to ensure fair working conditions and industrial peace. This legislation affects all employers and employees in Portugal, as well as trade unions and professional associations involved in collective bargaining.