Main Directorate of State Security

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Chronology of Soviet security agencies
1917–22	Cheka under Council of People's Commissars of the RSFSR (All-Russian Extraordinary Commission)
1922–23	GPU under NKVD of the RSFSR (State Political Directorate)
1920–91	PGU KGB or INO under Cheka (later KGB) of the USSR (First Chief Directorate)
1923–34	OGPU under SNK of the USSR (Joint State Political Directorate)
1934–46	NKVD of the USSR (People's Commissariat for Internal Affairs)
1934–41	GUGB of the NKVD of the USSR (Main Directorate of State Security of People's Commissariat for Internal Affairs)
1941	NKGB of the USSR (People's Commissariat of State Security)
1943–46	NKGB of the USSR (People's Commissariat for State Security)
1946–53	MGB of the USSR (Ministry of State Security)
1946–54	MVD of the USSR (Ministry of Internal Affairs)
1947–51	KI MID of the USSR (Committee of Information under Ministry of Foreign Affairs)
1954–78	KGB under the Council of Ministers of the Soviet Union (Committee for State Security)
1978–91	KGB of the USSR (Committee for State Security)
1991	MSB of the USSR (Interrepublican Security Service)
1991	TsSB of the USSR (Central Intelligence Service)
1991	KOGG of the USSR (Committee for the Protection of the State Border)
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The Main Directorate of State Security (Russian: Glavnoe upravlenie gosudarstvennoy bezopasnosti, Главное управление государственной безопасности, ГУГБ, GUGB) was the name of the Soviet Union's most important security body within the People's Commissariat of Internal Affairs (NKVD) USSR. At the time of its existence, which was from July 10, 1934 to February 3, 1941, the GUGB reflected exactly the Secret Operational Directorate within OGPU under the Council of People's Commissars,^[1] which operated within OGPU structure from 1923 to 1931/32. An intelligence service and secret police from July 1934 to February 1941, it was run under the auspices of the Peoples Commissariat of Internal Affairs (NKVD). Its first head was first deputy of People's Commissar of Internal Affairs (then Genrikh Yagoda), Commissioner 1st rank of State Security Yakov Agranov.