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

full_context: Document 1: Petrus killings: The Petrus killings were a series of extrajudicial executions in Indonesia that occurred between 1983 and 1985 under President Suharto's New Order regime. Without undergoing a trial, thousand of criminals were mysteriously shot to death by anonymous or undercover gunmen. Their bodies were then placed in public places which terrorized an unaware populace. The executions were part of a government effort to reduce crime and the actual death toll or extent of the killings remains a mystery today.
Document 2: Night of the Long Knives: The Night of the Long Knives (German:    ), also called Operation Hummingbird (German: "Unternehmen Kolibri") or, in Germany, the Röhm Putsch (German spelling: "Röhm-Putsch" ), was a purge that took place in Nazi Germany from June 30 to July 2, 1934, when the Nazi regime carried out a series of political extrajudicial executions intended to consolidate Hitler's absolute hold on power in Germany. Many of those killed were leaders of the "Sturmabteilung" (SA), the Nazis' own paramilitary organization, colloquially known as the "Brownshirts" due to the color of their uniforms. The best-known victim of the purge was Ernst Röhm, the SA's leader and one of Hitler's longtime supporters and allies. Leading members of the left-wing Strasserist faction of the Nazi Party (NSDAP), along with its figurehead, Gregor Strasser, were also killed, as were establishment conservatives and anti-Nazis, such as former Chancellor Kurt von Schleicher and Bavarian politician Gustav Ritter von Kahr, who had suppressed Adolf Hitler's Munich Beer Hall Putsch in 1923. The murders of SA leaders were also intended to improve the image of the Hitler government with a German public that was increasingly critical of thuggish Brownshirt tactics.
Document 3: Great Purge: 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.
Document 4: Grigory Levin: Grigory Mikhailovich Levin (Russian: Григорий Михайлович Левин ; 10 January 1902 – 26 January 1983) was a Soviet Army colonel and a Hero of the Soviet Union. Levin served as a Red Army officer in the late 1920s and fought in the Sino-Soviet conflict of 1929. He was demobilized in 1932 and worked as a statistician. Levin was called up again after the German invasion of the Soviet Union. He served with the 385th Rifle Division and the 354th Rifle Division, in which he led a regiment. He was seriously wounded in January 1944 and upon recovery became a regimental commander in the 37th Guards Rifle Division. Levin was awarded the title Hero of the Soviet Union for his leadership of the regiment in the Battle of Berlin. Levin retired from the army in 1954 and became chairman of the Altai Krai DOSAAF.
Document 5: Nikolai Gikalo: Nikolay Fyodorovich Gikalo (Russian: Николай Фёдорович Гикало ; born March 8, 1897, Odessa, Kherson Governorate – April 25, 1938) was a Soviet revolutionary and statesman. From 1915 he served in the Russian Imperial Army, in 1917 he joined the Russian Social Democratic Labour Party (Bolsheviks). He commanded the Red Army in the fight against the White Army in the Northern Caucasus. He was first secretary of the Azerbaijan Communist Party from 1929 to August 1930, first secretary of the Communist Party of the Uzbek SSR from April 1929 to June 11, 1929 and first secretary of the Communist Party of the Belorussian SSR from January 18, 1932, to March 18, 1937. During the Great Purge, Gikalo was arrested, accused of plotting against the Soviet state, sentenced to death and executed on April 25, 1938. He was exonerated posthumously in 1955.
Document 6: Nikolay Kuibyshev: The son of an Imperial Russian Army officer, Kuibyshev joined the army and fought in World War I. Kuibyshev joined the Red Army in 1918 and became commander of the 3rd and 9th Rifle Divisions on the Southern Front of the Russian Civil War. During the 1920s, Kuibyshev commanded a corps, courses for Red Army commanders, the group of Soviet advisors in China, and the Main Directorate of the Red Army, and the Siberian Military District. He became secretary for Rabkrin, the Workers' and Peasants' Inspectorate, and a member of the Party Control Commission during the 1930s. Kuibyshev became commander of the Transcaucasian Military District in 1937. During the Great Purge, he was arrested in February 1938 and executed in August. Kuibyshev was posthumously pardoned in 1956.
Document 7: Political repression in the Soviet Union: 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.
Document 8: 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.
Document 9: Indonesian mass killings of 1965–1966: The Indonesian mass killings of 1965–1966 (also variously known as the Indonesian massacres, Indonesian genocide, Indonesian Communist Purge, Indonesian politicide, or the 1965 Tragedy) were large-scale killings and civil unrest which occurred in Indonesia over many months, targeting communist sympathizers, ethnic Chinese and alleged leftists, often at the instigation of the armed forces and government. Initially it began as an anti-communist purge following a controversial coup attempt by the 30 September Movement in Indonesia. The most widely published estimates were that 500,000 to more than one million people were killed, with some more recent estimates going as high as two to three million. The purge was a pivotal event in the transition to the "New Order" and the elimination of the Indonesian Communist Party (PKI) as a political force. The upheavals led to the fall of President Sukarno and the commencement of Suharto's three-decade authoritarian presidency.
Document 10: Mikhail Meandrov: Mikhail Alekseyvich Meandrov (Russian: Михаил Алексеевич Меандров ) (October 22, 1894, Moscow - August 1, 1946, Moscow) was an Imperial Russian and later Soviet officer. Taken prisoner by the Germans in World War II near Leningrad in 1941, he later became an important commander (general) in the Nazi-allied Russian Liberation Army. Taken prisoner by the Soviets, he was executed in 1946.
Document 11: Red Terror: 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.
Document 12: NKVD prisoner massacres: The NKVD prisoner massacres were a series of mass executions carried out by the Soviet NKVD secret police during World War II against political prisoners across Eastern Europe, primarily Poland, Ukraine, the Baltic states, Bessarabia and other parts of the Soviet Union from which the Red Army was retreating following the Nazi German attack on the Soviet positions in occupied Poland, known as Operation Barbarossa.
Document 13: Stalinist repressions in Mongolia: The Stalinist repressions in Mongolia (Mongolian: Их Хэлмэгдүүлэлт , Ikh Khelmegdüülelt, ""Great Repression"") refers to a period of heightened political violence and persecution in the Mongolian People's Republic between 1937 and 1939. The repressions were part of the Stalinist purges (also known as the Great Purge) unfolding across the Soviet Union around the same period. Soviet NKVD advisors, under the nominal direction of Mongolia's "de facto" leader Khorloogiin Choibalsan, persecuted individuals and organizations perceived as threats to the Mongolian revolution and the growing Soviet influence in the country. As in the Soviet Union, methods of repression included show trials, torture, and imprisonment in remote forced labor camps. Estimates differ, but anywhere between 20,000 to 35,000 "enemies of the revolution" were executed, a figure representing three to five percent of Mongolia's total population at the time. Victims included those suspected of espousing lamaism, pan-Mongolist nationalism, and pro-Japanese sentiment with the Buddhist clergy, aristocrats, intelligentsia, political dissidents, and ethnic Buryats and Kazakhs suffering the greatest losses.
Document 14: 1st Cavalry Division (Soviet Union): 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.
Document 15: List of Soviet divisions 1917–45: The Soviet Union's Red Army raised divisions during the Russian Civil War, and again during the interwar period from 1926. Few of the Civil War divisions were retained into this period, and even fewer survived the reorganization of the Red Army during the 1937–1941 period. During the Second World War 400 'line' rifle divisions (infantry), 129 Soviet Guards rifle divisions, and over 50 cavalry divisions as well as many divisions of other combat support arms were raised in addition to the hundreds of divisions that existed in the Red Army before Operation Barbarossa. Almost all the pre-war mechanized and tank divisions were disbanded during the war. There were also Red Air Force aviation divisions, and the NKVD divisions which also took part in fighting. However, in contrast to Wikipedia's reasonably complete descriptions of U.S., British, and German divisions, only a few Soviet divisions have articles here, mostly because the detailed histories have either not been translated from Russian or have not been fully released from the official archives. (See ).
ground_truth: from 1936 to 1938