Leader who took the SFIO majority into the Comintern at Tours in 1920, founding the French Communist Party, and ran L’Humanité
Born in Paimpol in Brittany, he joined Guesde’s French Workers’ Party in 1891 and the unified SFIO in 1905, and from 1918 ran L’Humanité for the rest of his life. As his supporters swung towards the October Revolution after the war, he led the vote to join the Comintern at the Tours congress of 1920 and became a founder of the French Communist Party. He was jailed in 1923 for denouncing the French occupation of the Ruhr. A deputy and senator, he remained the party’s elder statesman until his death in 1958.