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.
Deportation of the Crimean Tatars The deportation of the Crimean Tatars (Crimean Tatar "Qırımtatar sürgünligi"; Russian "Депортация крымских татар"; Ukrainian "Депортація кримських татар") refers to the ethnic cleansing of Tatars from Crimea on 18 May 1944 carried out by Lavrentiy Beria, chief of the Soviet security and secret police, under the orders of Soviet leader Joseph Stalin. Within a space of three days, the Soviet NKVD deported at least 191,044 Crimean Tatar people in cattle trains—including women, children, and the elderly, as well as Communists and members of the Red Army−several thousands kilometers away to modern-day Uzbekistan. The deportation was ordered by Stalin as collective punishment for the 15,000–20,000 Tatars who had joined the Wehrmacht during the German occupation of Crimea in World War II, even though 25,033 Crimean Tatars had joined the Soviet Red Army during the war.