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Vincent Auriol was a member of the French Section of the Workers' International (SFIO), a socialist party founded in 1905. The SFIO played a significant role in French politics during the interwar period and the Fourth Republic, advocating for social reforms, workers' rights, and international cooperation. Auriol served as a member of the National Assembly, Minister of Finance, and Prime Minister before becoming President of France from 1947 to 1954.