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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Quick Facts Abbreviation, Founded ...

Socialist Left Izquierda Socialista
Abbreviation	IS
Founded	21 September 2006; 17 years ago (2006-09-21)[1]
Split from	MST[1]
Headquarters	Buenos Aires, Argentina
Newspaper	El Socialista
Youth wing	Juventud de Izquierda Socialista
Women's wing	Isadora
Membership (2017)	30,523[2][3]
Ideology	Trotskyism[4]
Political position	Far-left
National affiliation	Workers' Left Front[4]
International affiliation	International Workers' Unity – Fourth International[5]
Colours	Red
Seats in the Chamber of Deputies	0 / 257
Seats in the Senate	0 / 72
Website
izquierdasocialista.org.ar
Politics of Argentina Political parties Elections

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Members include Liliana Olivero, a former deputy in the provincial legislature in Córdoba Province, Argentina, Angélica Lagunas, a provincial deputy in Neuquén Province, Mercedes de Mendieta, a deputy in the Autonomous City of Buenos Aires, and Graciela Calderón, a deputy in Buenos Aires Province.