Chronology of Soviet secret police agencies to operate as well. 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
NKVD were renamed "ministries". Accordingly, the Peoples Commissariat of Internal Affairs (NKVD) of the USSR became the Ministry of Internal Affairs (MVD), while the NKGB was renamed as the Ministry of State Security (MGB). In 1953, after the arrest of Lavrenty Beria, the MGB merged back into the MVD. The police and security services finally split in 1954 to become: In 1935–1945 Main Directorate of State Security of NKVD had its own ranking system before it was merged in the Soviet military standardized ranking system. 1 – 1943; 2 – 1943–1945. The main function of the NKVD was to protect the