Nikolai Ivanovich Bukharin (1888 - 1938) was a Russian Marxist, Bolshevik revolutionary, and Soviet politician. He was a member of the Politburo (1924-1929) and Central Committee (1917-1937), chairman of the Communist International (Comintern, 1926-1929), and the editor in chief of Pravda (1918-1929), the journal Bolshevik (1924-1929), Izvestia (1934-1936), and the Great Soviet Encyclopedia. He authored Imperialism and World Economy (1918), The ABC of Communism (1919. co-authored with Yevgeni Preobrazhensky), and Historical Materialism (1921) among others. Initially a supporter of Joseph Stalin after Vladimir Lenin's death, he came to oppose a large number of Stalin's policies and was one of Stalin's most prominent victims during the "Moscow Trials" and purges of the Old Bolsheviks in the late 1930s.