People's Commissariat for State Security

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Chronology of Soviet security agencies
1917–22	Cheka of the Sovnarkom of the RSFSR (All-Russian Extraordinary Commission)
1922–23	GPU of the NKVD of the RSFSR (State Political Directorate)
1923–34	OGPU of the Sovnarkom of the USSR (Joint State Political Directorate)
1934–41 1941–43	NKVD of the USSR (People's Commissariat for Internal Affairs) GUGB of the NKVD of the USSR (Main Directorate of State Security)
1941 1943–46	NKGB of the USSR (People's Commissariat for State Security)
1946–53	MGB of the USSR (Ministry of State Security)
1953–54	MVD of the USSR (Ministry of Internal Affairs)
1954–91	KGB of the Council of Ministers of the USSR (Committee for State Security)
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The People's Commissariat for State Security (Russian: Народный комиссариат государственной безопасности) or NKGB, was the name of the Soviet secret police, intelligence and counter-intelligence force that existed from 3 February 1941 to 20 July 1941, and again from 1943 to 1946, before being renamed the Ministry for State Security (MGB).