Main Directorate of 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 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.