When did the campaign of political  repression that Mikhail Demichev was arrested during occur?
Mikhail Demichev Mikhail Demichev (1885 – November 19, 1937) was a Soviet Komdiv (division commander). He fought in the Imperial Russian Army in World War I before going over to the Bolsheviks in the subsequent civil war. He was a recipient of the Order of the Red Banner. During the Great Purge, he was arrested on August 9, 1937 and later executed. After the death of Joseph Stalin, he was rehabilitated in 1956.
Pyotr Demichev Pyotr Nilovich Demichev (Russian: Пётр Нилович Демичев ; 21 December [O.S. 3 January 1918] 1917 10 August 2010) was a Soviet-Russian political figure. He was First Deputy Chairman of the Presidium of the Supreme Soviet from 1986 to 1988 and Minister of Culture from 1974 to 1986. He was a deputy Politburo member beginning in 1964. He was considered to be a "Communist Party ideologist" with little sympathy for liberal movements within the Soviet Union.