Joint State Political Directorate

The Joint State Political Directorate (Russian: Объединённое государственное политическое управление, IPA: [ɐbjɪdʲɪˈnʲɵn(ː)əjə ɡəsʊˈdarstvʲɪn(ː)əjə pəlʲɪˈtʲitɕɪskəjə ʊprɐˈvlʲenʲɪje]), abbreviated as OGPU (Russian: ОГПУ), was the secret police of the Soviet Union from November 1923 to July 1934, succeeding the State Political Directorate (GPU). Responsible to the Council of People's Commissars, the OGPU was headed by Felix Dzerzhinsky until 1926, then by Vyacheslav Menzhinsky until replaced by the Main Directorate of State Security (GUGB) within the People's Commissariat for Internal Affairs (NKVD).

Source: Wikipedia — Joint State Political Directorate (CC BY-SA 4.0)