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Nahuel Moreno (April 24, 1924 - January 25, 1987) (real name Hugo Bressano) was a Trotskyist leader from Argentina. Moreno was active in the Trotskyist movement from before World War II until his death. With the 1953 split in the Fourth International he backed the International Committee faction led by the Socialist Workers Party in the USA.

Nahuel Moreno

He then organised a group which sought to act as the left wing of the Peronist movement, publishing a journal called Palabra Obrera. In the 1960s he founded the Socialist Workers Party (PST) of Argentina, having sided with the SWP when it fused with the European based International Secretariat to form the United Secretariat of the Fourth International (USFI).

Prior to the reunification of the two factions in 1963, the International Secretariat's leader in Latin America, J. Posadas, split to form his own Fourth International (Posadist). Posadas' departure cleared the way for Moreno to become leader of the USFI's Latin American Bureau.

By this time the PST was quite sizeable and Moreno was the head of the former ICFI forces in Latin America. As factional differences within the USFI peaked, the American SWP formed the Leninist Trotskyist Faction, of which Moreno's PST was a part, until he formed his own Bolshevik Faction when the LTF was dissolved.

His BF left the USFI late in 1979, partly in opposition to the USFI's support for the FSLN, and formed a new international grouping with Pierre Lambert's supporters but this lasted only until 1981. Moreno and his supporters then formed their own international grouping, the International Workers' League (IWL), mostly, but not exclusively, based in Latin America around the Argentine Movement for Socialism (MAS) and the Brazilian Socialist Convergence, now the United Socialist Workers' Party (PSTU).

• (English) Moreno's writings
• (Spanish) Moreno's writings
• International Workers League - Fourth International