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Parti social démocratique du Québec

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The Parti social démocratique du Québec (PSD ; English: Social Democratic Party of Quebec) was the Quebec wing of the Co-operative Commonwealth Federation. It was founded in 1939 as the Fédération du Commonwealth Coopératif and was led by Romuald-Joseph Lamoureux in the 1944 general election, by Thérèse Casgrain from 1951 to 1957 and by Michel Chartrand from 1957 to 1960. The name Parti social démocratique was adopted in 1955.

The party was refounded in 1963 as the New Democratic Party of Quebec (Nouveau Parti démocratique du Québec). That party renamed itself to Parti de la Democratie Socialiste (Party of Socialist Democracy) following a split with the federal NDP over the question of Quebec independence.