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Socialist Left (Spanish: Izquierda Socialista; IS), officially registered as the Left for a Socialist Option (Izquierda por una Opción Socialista), is a Trotskyist political party in Argentina. It was founded in 2006 as a split from the Socialist Workers' Movement. It is the Argentine section of International Workers' Unity – Fourth International. It is one of three parties that make up the Workers' Left Front.
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