Question: When did the campaign of political  repression that Mikhail Demichev was arrested during occur?

Context articles: 1st Cavalry Division (Soviet Union)
Political repression in the Soviet Union
Great Purge
Perm-36
Preventive repression
History of the Communist Party USA
Monument to innocent murdered
Red Terror
Mikhail Demichev
United Nations Security Council Resolution 688

On 6 May 1922 the 8th Zaporozhye Cossack Cavalry Division of the 1st Red Cossacks Cavalry Corps became the 1st Zaporozhye Cossack Cavalry Division.
 The division was commanded by Mikhail Demichev, the former commander of the 8th Cavalry Division.
Throughout the history of the Soviet Union tens of millions of people became victims of political repression, which was an instrument of the state since the October Revolution.
 Culminating during the Stalin era, it still existed during the "Khrushchev Thaw", followed by increased persecution of Soviet dissidents during the Brezhnev stagnation, and didn't cease to exist during Mikhail Gorbachev's perestroika.
 Its heritage still influences the life of modern Russia and other former Soviet states.
The Great Purge or the Great Terror (Russian: Большо́й терро́р ) was a campaign of political repression in the Soviet Union which occurred from 1936 to 1938.
 It involved a large-scale purge of the Communist Party and government officials, repression of peasants and the Red Army leadership, widespread police surveillance, suspicion of "saboteurs", "counter-revolutionaries", imprisonment, and arbitrary executions.
 Mobile gas vans were invented to execute people without trial.
 In Russian historiography, the period of the most intense purge, 1937–1938, is called Yezhovshchina (Russian: Ежовщина ; literally, "Yezhov phenomenon", commonly translated as "times of Yezhov" or "doings of Yezhov"), after Nikolai Yezhov, the head of the Soviet secret police, the NKVD, who was later killed in the purge.
 It has been estimated that 600,000 people died at the hands of the Soviet government during the Purge.
Perm-36 (also known as ITK-6) was a Soviet forced labor camp located near the village of Kuchino, 100 km (60 miles) northeast of the city of Perm in Russia, part of the large prison camp system run by the Soviet Union (now Russia) in the Stalin era known as the Gulag.
 Built in 1946 and closed December 1987, the camp was preserved as a museum in 1994 by the private Russian human rights organization Memorial and since 1995 has been open to the public as The Museum of the History of Political Repression Perm-36 (known popularly as the Gulag Museum) operated by the private non-commercial organization "Memorial Center of Political Repression "Perm-36"" It is the only remaining example of a Gulag labor camp, the others having been demolished by the Soviet government at the dissolution of the Soviet Union.
Preventive repression is political repression of political opponents before they actually carry out any activities that would threaten the current political system.
 The term was used to describe the political methods of the Paraguay "caudillo" Stroessner, whose methods of "nipping in the bud" the possibilities of any real or imagined unrest were reported at a 1972 Inter-American Defense Board meeting of US and Latin American military.
The history of the Communist Party USA is deeply rooted in the history of the American labor movement.
 Communists played critical roles in the earliest struggles to organize American workers into unions, as well as the later civil rights movements and anti-war movements.
 However, many Communists were forced to work covertly due to the high level of political repression in the United States against Communists, whom were targeted for legal retaliation and in some areas state-supported terrorism and lynchings.
 According to Gus Hall, who served as the General Secretary of the party for most of the later 20th Century, Communists' scientific understanding of the nature of class struggle enables them to be the most effective organizers, a benefit he called the "Communist plus".
 When Communists were expelled from the AFL-CIO in 1948, organized labor's influence on economic and political development stagnated and later plummeted.
 The Communist Party greatly suffered under the ensuing period of McCarthyism, in which the US government openly carried out mass repression against Communists and simultaneously ran a nationalist propaganda campaign fueling the Cold War against the Soviet Union which would dominate US foreign policy for the rest of the century.
 After the dissolution of the USSR in 1991, the US government ended its espionage and police violence against the party, but the party went through another split over differences in adapting to the post-Soviet period.
 The party remains active but never recovered the influence it had during its height in the 1930s and 40s.
Monument to innocent murdered (Russian: Памятник Невинно убиенным ) is a memorial in the center of Rostov-on-Don, which was erected in memory of repressed people from Rostov Oblast between 1921 and 1961.
 The opening ceremony of the monument took place on October 30 1994, when Day of Remembrance of the Victims of Political Repressions has been commemorated.
 Rostov Oblast Association of Victims of Political Repression "Memorial" and its Chairman E. Yemelyanova have initiated building of the monument.
 The rally in memory of victims of political repression and floral tribute are held annually.
 Between 1921 and 1961 90,000 of people were repressed.
 16,300 of them were shot.
 Burial sites remain unknown.
The Red Terror was a period of political repression and mass killings carried out by Bolsheviks after the beginning of the Russian Civil War in 1918.
 Soviet historiography describes the Red Terror as having been officially announced in September 1918 by Yakov Sverdlov and ending about October 1918.
 However, the term was frequently applied to Bolshevik political repression during the whole period of the Civil War (1917–1922), as distinguished from the White Terror carried out by the anti-Bolshevik side.
 The Cheka (the Bolshevik secret police) carried out the repressions of the Red Terror.
 Estimates for the total number of people killed during the Red Terror range from 10,000 to over 1.5 million.
 The majority of the violence's targets were representatives of the Tsarist regime and former Tsarist officers, along with significant numbers of bourgeoisie.
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.
United Nations Security Council Resolution 688, adopted on 5 April 1991, after receiving letters from the representatives of France, Iran, and Turkey and expressing its concern over political repression of the Iraqi people, including those in Iraqi Kurdistan, the Council condemned the repression and demanded that Iraq, as a contribution to removing the threat to international peace and security, end the repression and respect the human rights of its population.