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.
Mikhail Drozdovsky Mikhail Gordeevich Drozdovsky (Russian: Михаил Гордеевич Дроздовский ) (October 7, 1881 – January 1, 1919) was a Russian army officer and one of the military leaders of the anti-Bolshevik White movement during the Russian Civil War.