Sergei Yakovlevich Efron (Russian: Сергей Яковлевич Эфрон; 8 October 1893 – 11 September 1941) was a Russian poet, White Army officer, and the husband of fellow poet Marina Tsvetaeva. While in exile, he was recruited by the Soviet NKVD.[1] After returning to the USSR from France, he was executed.
- ^ Schwartz, Stephen (24 January 1988). "Intellecturals and Assassins – Annals of Stalin's Killerati". New York Times. Retrieved 6 August 2012.