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Centro de Estudios Carlos Marx (Karl Marx Study Centre) was a left-wing group in Argentina. The Centre was founded in 1912 by a dissident group within the Socialist Party. This was the first organized expression of opposition to the reformist leadership of the party. The Centre published Palabra Socialista.
References
Guerra, Sergio/Prieto, Alberto. Cronologia del movimiento obrero y las luchas por la revolución socialista en América Latina y el Caribe (1917-1939). Havana: Casa de las Americas, 1980. p. 13