Jacques Numa Sadoul, commonly known as Captain Sadoul (Russian: Жак Саду́ль, Zhak Sadul; May 22, 1881 – November 18, 1956), was a French lawyer, communist politician, and writer, one of the founders of the Communist International. He began his career in the French Section of the Workers' International (SFIO) in Vienne, and, by the time of World War I, was serving under Albert Thomas, the Minister of Armaments. A French Army Captain, he was Thomas' envoy to the Russian Republic, keeping contact with the socialist circles and steering them toward the Entente Powers. After the October Revolution, he maintained close contacts with the Bolsheviks, pledging them his support against the Central Powers during the crisis of 1917–1918. He was unable to prevent Bolshevist Russia from signing the Trea