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.
1968 Red Square demonstration The 1968 Red Square demonstration (Russian: Демонстра́ция 25 а́вгуста 1968 го́да ) took place on 25 August 1968 at Red Square, Moscow, Soviet Union, to protest the invasion of Czechoslovakia by the Soviet Union and its Warsaw Pact allies, that occurred during the night of 20–21 August 1968, crushing the Prague spring, a set of de-centralization reforms promoted by Alexander Dubček.