Gauche Socialiste is a Trotskyist faction within Québec socialiste (formerly the Parti de la Democratie Socialiste (PDS) in Quebec, Canada). It was formed in 1983 by Trotskyists who left or were expelled from the Revolutionary Workers League/Ligue Ouvrière Révolutionnaire when the group turned away from Trotskyism in the early 1980s and was the successor of Organisation Combat Socialiste which existed from 1980 to 1982 and Mouvement socialiste which had been founded in 1982.
Gauche Socialiste is the Quebec section of the United Secretariat of the Fourth International. The group's counterpart in English Canada was Socialist Challenge which later dissolved into the New Socialist Group . The group publishes the periodical La Gauche.
The PDS, formerly the Quebec wing of the New Democratic Party of Canada, joined several other parties to form the Union des forces progressistes (UFP) in 2002.
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