SFIO general secretary who led the Tours vote to join the Comintern, became the first PCF general secretary and left in 1923
A teacher from the Belfort region, he joined the SFIO and became its general secretary in 1918. After visiting Moscow with Cachin in 1920 he backed joining the Comintern at the Tours congress and became the first general secretary of the new French Communist Party. Clashing with the Comintern’s demands for discipline, he left in January 1923 and returned to the SFIO. He served as a minister in several governments in the 1930s and joined Pétain’s first cabinet in June–July 1940, but declined to serve Vichy; after the war he was tried for collaboration and acquitted.