The General Confederation of Labor (in Spanish: Confederación General del Trabajo, CGT) is a national trade union federation in Argentina founded on September 27, 1930, as the result of the merger of the U.S.A (Unión Sindical Argentina) and the C.O.A (Confederación Obrera Argentina) trade unions. Nearly one out of five employed – and two out of three unionized workers in Argentina – belong to the CGT, one of the largest labor federations in the world. It was founded in 1930 by socialists, communists and independents to generate a plural union central. It had a socialist majority until 1945 and Peronist since then. The CGT during the Infamous Decade The CGT was founded on September 27, 1930, the result of an agreement between the Socialist Confederación Obrera Argentina (COA) and the Revolutionary Syndicalist Unión Sindical Argentina (USA), which had succeeded to the FORA IX (Argentine Regional Workers' Federation, Ninth Congress); smaller, Communist-led unions later joined the CGT as well. The COA, which included the two unions covering rail transport in Argentina (Unión Ferroviaria and La Fraternidad), was the larger of the two with 100,000 members; the USA, which included, telephone, port, tramway, and public sector unions, represented 15,000. During the Infamous Decade of the 1930s and subsequent industrial development, the CGT began to form itself as a strong union, competing with the historically anarchist FORA V (Argentine Regional Workers' Federation, Fifth Congress). Centered initially around the railroad industry, the CGT was headed in the 1930s by Luis Cerruti and José Domenech (Unión Ferroviaria); Ángel Borlenghi (Confederación General de Empleados de Comercio); and Francisco Pérez Leirós (Unión de Obreros Municipales). The CGT became the Argentine affiliate of the International Federation of Trade Unions (an organization that both USA and COA had been members of for shorter periods). The CGT split in 1935 over a conflict between Socialists and Revolutionary Syndicalists, leading to the creation of the CGT-Independencia (Socialists & Communists) and the CGT-Catamarca (Revolutionary Syndicalists). The latter reestablished the Unión Sindical Argentina (USA) in 1937. The CGT again split in 1942, creating the CGT n°1, headed by the Socialist railroader José Domenech and opposed to Communism; and the CGT n°2, also headed by a Socialist (Pérez Leirós), which gathered Communist unions (construction, meat, print) and some important Socialist unions (such as the retail workers' union led by Borlenghi and the municipal workers' union led by Pérez Leirós). The CGT following the "Revolution