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Section Française de l'Internationale Ouvrière

French Section of the Workers' International
Section Française de l'Internationale Ouvrière
Historic leaders Jean Jaurès,
Paul Lafargue,
Jules Guesde,
Édouard Vaillant,
Léon Blum,
Vincent Auriol,
Daniel Mayer,
Guy Mollet
Founders Jean Jaurès, Jules Guesde
Founded April 25, 1905 (1905-04-25)
Dissolved May 4, 1969 (1969-05-04)
Merger of Socialist Party of France, French Socialist Party
Merged into Socialist Party
Headquarters Paris
Newspaper L'Humanité
Trade union wing Workers' Force
Ideology Socialism (France)
Internal factions:
 • Democratic socialism
 • Social democracy
 • Possibilism
 • Blanquism
Political position Left-wing
National affiliation Lefts Cartel (1924–34)
Popular Front (1936–38)
Tripartisme (1944–47)
Third Force (1947–58)
European affiliation None
International affiliation Second International (1905–16),
Labour and Socialist International (1923–40),
Socialist International (1951–69)
European Parliament group Socialist Group
Colours      Red

The French Section of the Workers' International (French: Section Française de l'Internationale Ouvrière, SFIO) was a French socialist political party founded in 1905 and replaced in 1969 by the current Socialist Party (PS). It was created during the 1905 Globe Congress in Paris as a merger between the French Socialist Party and the Socialist Party of France, in order to create the French section of the Second International (i.e. the Workers' International), designated as the "party of the workers' movement".

The SFIO was led by Jules Guesde, Jean Jaurès (who quickly became its most influential figure), Édouard Vaillant and Paul Lafargue, and united the Marxist tendency represented by Guesde with the social-democratic tendency represented by Jaurès. The SFIO opposed itself to colonialism and to militarism, although it abandoned its anti-militarist views and supported the National Union government (Union nationale) facing Germany's declaration of war on France.

Having replaced internationalist class struggle with patriotism thus like the whole Second International, and because of conflicting views towards the 1917 Russian Revolution and the Bolshevik-led Third International, the SFIO split into two groups during the 1920 Tours Congress: the majority created the Section française de l'Internationale communiste (SFIC) which joined the Third International and became the French Communist Party, while the minority continued as the SFIO.


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