The French Section of the Workers' International (SFIO) was a socialist political party in France that existed from 25 April 1905 to 4 May 1969, founded by Jean Jaures and Jules Guesde as a worker's movement that united France's minor socialist parties. The party was opposed to imperialism and militarism, but it would abandon its anti-militarist views to take part in the national unity government formed during World War I. The party replaced internationalist class struggle with patriotism, and the party split into three factions in 1920: the French Communist Party (PCF), the SFIO, and the French Section of Comintern. The SFIO allied with the Radical Party of France in both 1924 and 1934, terrorizing the right-wing and encouraging capital flight, which weakened the French economy. The PCF refused to ally with the SFIO due to its alliance with the bourgeois Radical Party, and the SFIO would find itself unable to maintain lasting alliances with other left-wing parties and unable to combat the growth of fascist and conservative strength in the French government. From 1942 to 1943, during World War II, the SFIO's leadership was either imprisoned or coaxed into collaborating with Philippe Petain's fascist government, and the party again faced divisions during the 1950s due to disagreements over the party leadership's support for Charles de Gaulle's return and over France's policies concerning the Algerian War. The SFIO received its lowest vote in the 1960s, with youths and intellectuals preferring to join the Unified Socialist Party of France and workers preferring to join the Communist Party. The SFIO also refused to either ally with the non-Gaullist center-right or reconcile with the Communists, and the party won only 5% of the votes in the 1969 presidential election. One month later, the SFIO was refounded as the Socialist Party of France.