Felix Dzerzhinsky in the context of Social Democracy of the Kingdom of Poland and Lithuania

The All-Russian Extraordinary Commission (Russian: Всероссийская чрезвычайная комиссия, romanized: Vserossiyskaya chrezvychaynaya komissiya, IPA: [fsʲɪrɐˈsʲijskəjə tɕrʲɪzvɨˈtɕæjnəjə kɐˈmʲisʲɪjə]), abbreviated as VChK (Russian: ВЧК, IPA: [vɛ tɕe ˈka]), and commonly known as the Cheka (Russian: ЧК, IPA: [tɕɪˈka]), was the first Soviet secret police organization. It was established on 20 December [O.S. 7 December] 1917 by the Council of People's Commissars of the Russian SFSR, and was led by Felix Dzerzhinsky. By the end of the Russian Civil War in 1922, the Cheka had at least 200,000 personnel.

Ostensibly created to protect the October Revolution from "class enemies" such as the bourgeoisie and members of the clergy, the Cheka soon became a tool of repression wielded against all political opponents of the Bolshevik regime. The organization had responsibility for counterintelligence, oversight of the loyalty of the Red Army, and protection of the country's borders, as well as the collection of human and technical intelligence. At the direction of Vladimir Lenin, the Cheka performed mass arrests, imprisonments, torture, and executions without trial in what came to be known as the "Red Terror". It policed the Gulag system of labor camps, conducted requisitions of food, and put down rebellions by workers and peasants. The Cheka was responsible for executing at least 50,000 to as many as 200,000 people, though estimates vary widely.

The Joint State Political Directorate (Russian: Объединённое государственное политическое управление, IPA: [ɐbjɪdʲɪˈnʲɵn(ː)əjə ɡəsʊˈdarstvʲɪn(ː)əjə pəlʲɪˈtʲitɕɪskəjə ʊprɐˈvlʲenʲɪje]), abbreviated as OGPU (Russian: ОГПУ), was the secret police of the Soviet Union from November 1923 to July 1934, succeeding the State Political Directorate (GPU). Responsible to the Council of People's Commissars, the OGPU was headed by Felix Dzerzhinsky until 1926, then by Vyacheslav Menzhinsky until replaced by the Main Directorate of State Security (GUGB) within the People's Commissariat for Internal Affairs (NKVD).

The OGPU played an important role in the Soviet Union's forced collectivization of agriculture under the leadership of Joseph Stalin, crushing resistance and deporting millions of peasants to the growing network of Gulag forced labor camps. The OGPU operated both inside and outside the country, persecuting political criminals and opponents of the Bolsheviks such as White émigrés, Soviet dissidents, and anti-communists.

Vyacheslav Rudolfovich Menzhinsky (Russian: Вячесла́в Рудо́льфович Менжи́нский, Polish: Wiesław Rudolfowicz Mężyński; 31 August [O.S. 19 August] 1874 – 10 May 1934) was a Soviet revolutionary and politician who served as chairman of the OGPU, the secret police of the Soviet Union, from 1926 to 1934.

Born to Polish parents in Saint Petersburg, Menzhinsky joined the Russian Social Democratic Labour Party in 1902. He emigrated from Russia in 1907, and spent the next decade in Europe and the United States. After the 1917 February Revolution, he joined the Cheka in 1919, and in 1923 was promoted to its deputy under Felix Dzerzhinsky. After his death in 1926, Menzhinsky became head of the Cheka's successor, the OGPU. He worked to crush resistance in the countryside during Joseph Stalin's forced agricultural collectivization.