Career
He was allegedly killed in the Great Purges. Sedov was a Moscow-based engineer who published works on thermodynamics and diesel engines. He became a professor at the Moscow Institute of Technology while still in his twenties.
Nevertheless, he was caught up in the Great Purges as Trotsky"s son.
He was arrested in Moscow in early 1935 and sentenced to 5 years in exile in Krasnoyarsk, Siberia, in August 1935. More recently, Robert Service in Trotsky: A Biography, asserts that as an engineer Sergei did find work in a gold mine in Krasnoyarsk.
Sedov was killed in the next round of Stalin"s purges in 1937, although the exact details of his death are unknown. The Soviet secret police, People’s Commissariat of Internal Affairs, announced in early 1937 that Sedov had been charged with trying to poison factory workers and the date of his final death sentence is believed to be October 29, 1937, but there have also been unconfirmed reports that he died in a prison uprising.