In 1906, after toppling the more moderate party chairman J. K. Kari, Kuusinen came to dominate Finland's Social Democratic Party. He was a member of Finland's Parliament from 1908 to 1910, from 1911 to 1913 and again from 1916 to 1918 as well as the party's chairman from 1911 to 1917. He was a leader of the January 1918 revolution in Finland that created the short-lived Finnish Socialist Workers' Republic, of which he was appointed People's Commissar of Education. After the republic was defeated in the Finnish Civil War in 1918, Kuusinen fled to Moscow and helped form the Finnish Communist Party.