IC had been an alliance led by Partit Socialista Unificat de Catalunya and was the equivalent of Izquierda Unida in Catalonia.

This ideology is summarized in the book The Ecosocialist Manifesto, co-written by a number of left-wing green politicians.

From an ecosocialist point of view, both communism and capitalism are two faces of the productivist "mode of production" (a Marxist term), which should be phased out if the ecological health of the planet is to survive.

The manifesto also considers this ideology to be deeply feminist and in favour of the "freedom of the European peoples" (i.e. for self-determination for the Basque Country, Galicia or Catalonia).

[6] The party voted in favour of the Catalan parliament's declaration defining Catalonia as a "sovereign political and juridical entity" ("subjecte polític i jurídic sobirà") in 2013.