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The United Socialist Workers' Party (Partido Socialista de los Trabajadores Unificado, PSTU) is the Argentine section of the International Workers' League (Fourth International) (LIT), a Trotskyist-Morenoist grouping.

It was formed in 2011 by the fusion of the FOS and the COI, two groups associated with the LIT.

• Official website
• report on formation

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