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.
Operation Priboi Operation Priboi ("Coastal Surf") was the code name for the Soviet mass deportation from the Baltic states on 25–28 March 1949. The action is also known as the March deportation by Baltic historians. More than 90,000 Estonians, Latvians and Lithuanians, labeled as enemies of the people, were deported to forced settlements in inhospitable areas of the Soviet Union. Over 70% of the deportees were women, and children under the age of 16.