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Yevgeni Alekseyevich Preobrazhensky (Russian: Евге́ний Алексе́евич Преображе́нский, IPA: [jɪvˈɡʲenʲɪj ɐlʲɪkˈsʲejɪvʲɪtɕ prʲɪəbrɐˈʐɛnskʲɪj]; 1886–1937) was a Russian revolutionary, Soviet economist and sociologist. A member of the governing Central Committee of the Bolshevik faction and its successor, the All-Union Communist Party, Preobrazhensky is remembered as a leading voice for the rapid industrialisation of peasant Russia through a concentration on state-owned heavy industry.
Closely associated with Leon Trotsky and the Left Opposition movement of the 1920s, Preobrazhensky fell afoul of Stalin. He recanted Trotskyism in 1929, but eventually joined a secret alliance with Trotsky in 1932. He was arrested in 1933 and shot in 1937 during the Great Purge.