The relationship between peronism and the union movement determined the origins of this political movement and its subsequent power. Nowadays, in most of the new researches about the period which comprises the years between 1946 and 1955, and having overcomed the traditional approaches which outlined the monolithic cooption of the working organizations by President Juan Domingo Perón, this bond is analyzed from a different angle: presupposing an active syndical actor with autonomous political practices. The opening of the Argentinian historiographic field makes it posible to analize this political-syndical relationship from a “new” perspective.