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.
Sergei Ogoltsov Sergei Ivanovich Ogoltsov ("Сергей Иванович Огольцов" in Russian; August 29, 1900 – October 26, 1976) was a Russian member of the Soviet NKVD from 1936 until it was reorganized as the MGB in 1946. He served in the MGB until his arrest in 1953. He was the Deputy Director of State Security (MGB) from July 14, 1951 to August 9, 1951. By the time he was arrested in 1953 he had risen to the rank of Lieutenant General in the NKVD. He was released from prison in 1953 after a short arrest and he retired from the MGB. He died in 1976.