A fellow traveller is a person who is intellectually sympathetic to the ideology of a political organization, and who co-operates in the organization's politics, without being a formal member. In the early history of the Soviet Union, the Bolshevik revolutionary and Soviet statesman Anatoly Lunacharsky coined the term poputchik and later it was popularized by Leon Trotsky to identify the vacillating intellectual supporters of the Bolshevik government. It was the political characterisation of the Russian intelligentsiya who were philosophically sympathetic to the political, social, and economic goals of the Russian Revolution of 1917, but who did not join the Communist Party of the Soviet Union. The usage of the term poputchik disappeared from political discourse in the Soviet Union during the Stalinist era, but the Western world adopted the English term fellow traveller to identify people who sympathised with the Soviets and with Communism.