Anticapitalistas, known as Izquierda Anticapitalista until January 2015 and as Espacio Alternativo from 1995 to November 2008, is a socialist political organisation that works as a confederation in Spain. Anticapitalistas is defined as a revolutionary socialist, anti-capitalist, proletarian internationalist, republican, and eco-socialist organisation, assuming Marxism in an open, plural, and critical sense. Its stated objective is the rebuilding of the revolutionary project through the creation of a unitary, anti-capitalist political expression sustained by the anti-globalisation movement, the labor movement, and the social movements at large. It is a member of the Fourth International (post-reunification), a Trotskyist international organisation reformed in 1963.