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.
State Political Directorate The State Political Directorate (also translated as the State Political Administration) (GPU) was the intelligence service and secret police of the Russian Soviet Federative Socialist Republic (RSFSR) from February 6, 1922 to December 29, 1922 and the Soviet Union from December 29, 1922 until November 15, 1923.