Marcel Cachin (20 September 1869 – 12 February 1958) was a French Communist politician and the first editor of the daily newspaper L'Humanite. In 1891, Cachin joined Jules Guesde's French Workers' Party (POF). In 1905, he joined the new French Section of the Workers' International (SFIO) and won election to the Chamber of Deputies representing the Seine in 1914. He rallied the Union sacrée during the First World War and was sent to Russia in a mission in 1917. On that occasion he strongly supported Kerensky's Provisional Government, which was pledged to continue Russia's participation in World War I, and denounced Lenin and the Bolsheviks. In 1918, he was one of the speakers at a patriotic rally held at Strasbourg, to celebrate the city's return to French rule.