 Formed in 1979 as a coalition between the Catalan Workers Bloc (BCT) and the Socialist Party of National Liberation (PSAN), along with some independents, like Lluís Maria Xirinacs.In the local elections of that year the coalition gained 19 town councillors and 2 mayors (Arbúcies and Sant Pere de Ribes).In the city of Barcelona the Bloc withdrew the candidacy, supporting the PSUC and the Socialists' Party of Catalonia.