1924 to 1936 he was the head of the Economic Planning Department of the Supreme Economic Council, the Deputy People's Commissar of Finance of the USSR. In 1936–37, he was deputy chairman of the Supreme Court of the RSFSR. Arrest and death Mantsev was arrested during the Great Purge on 22 October 1937. On 7 March 1938 he was called as a witness at the third and largest of the Moscow show trials, and made to testify that in 1918 Bukharin and the Left Communists had plotted to overthrow the soviet government and kill Lenin, Stalin and Yakov Sverdlov - an accusation that the communist authorities acknowledged to have been false, after Stalin's death. Mantsev was sentenced to death on 28 July, and executed on 19 August 1938. He was 'rehabilitated' in 1956. References 1889 births 1939 deaths People from Moscow Bolsheviks Cheka officers Soviet interior ministers of Ukraine Republican Cheka (Ukraine) chairmen