OGPU
(also Ogpu)
An organization for investigating and combating counter-revolutionary activities in the former Soviet Union, existing from 1922 (1922-3 as the GPU) to 1934 and replacing the Cheka. It was absorbed into the NKVD in 1934.
Origin
Acronym from Russian Obʺedinënnoe gosudarstvennoe politicheskoe upravlenie 'United State Political Directorate'.