Chronology of Soviet secret police agencies Chronology of Soviet secret police agencies <br> There was a succession of Soviet secret police agencies over time. The first secret police after the October Revolution, created by Vladimir Lenin's decree on December 20, 1917, was called "Cheka" (ЧК). Officers were referred to as "chekists", a name that is still informally applied to people under the Federal Security Service of Russia, the KGB's successor in Russia after the dissolution of the Soviet Union. For most agencies listed here secret policing operations were only part of their function; for instance, the KGB was both the secret police and the intelligence agency.
NKVD (INU); GUGB political police unit represented by Secret Political Department (SPO) became Secret Political Directorate (SPU), and so on. The former GUGB 4th Department (OO) was split into three sections. One section, which handled military counter-intelligence in NKVD troops (former 11th Section of GUGB 4th Department OO) become 3rd NKVD Department or OKR (Otdel KontrRazvedki), the chief of OKR NKVD was Aleksander Belyanov.<br> After the German invasion of the Soviet Union (June 1941),the NKGB USSR was abolished and on July 20, 1941 the units that formed NKGB becomes part of NKVD USSR. The military CI was also upgraded from department