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In page Emilio Frugoni:

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In 1920, he demanded a Party agreement on its position towards the October Revolution and Bolshevism. In the 1921 Congress, the PS voted to join the Comintern, and turned itself into the Communist Party of Uruguay (PCU); Frugoni refused to adhere to the party line, and refounded the PS as a non-communist group. In the 1928 elections, the PCU obtained 3,911 votes, and the PS 2,931.