Proper noun
OGPU
(historical) The Joint State Political Directorate (Russian: Объединённое государственное политическое управление), the intelligence and state security service and secret police of the Soviet Union from 1923 to 1934.
However, kulaks proper made up only 4% of the peasant population; the "kulaks" that Stalin targeted included the slightly better-off peasants who took the brunt of violence from the OGPU and the Komsomol. Source: Internet
The Unified State Political Administration (OGPU) quickly realized the problem, and began to reform the dekulakization process. Source: Internet
Philby also dealt with Anatoly Gorsky (code-name Kap) the OGPU rezident in London and his predecessor, a German known as Reif (code-name Mar). Source: Internet