KGB (transliteration of "КГБ") is the Russian-language abbreviation for State Security Committee, (Russian: Комите́т госуда́рственной безопа́сности (info • help); Komitet gosudarstvennoy bezopasnosti).
Sometimes the KGB secretly killed people who did not agree with the Soviet Union's leaders.
In March 1953, Lavrenty Beria merged the MVD and the MGB into one agency--the MVD. In December of that year, Beria and 6 associates were executed and MVD was split. The re-formed MVD retained its police and law enforcement powers, while the second, new agency, the KGB, did the internal and external security functions, and reported to the Council of Ministers.
On July 5, 1978 the KGB was renamed as the "KGB of the Soviet Union", with its chairman holding a ministerial council seat. The KGB ended when its chief, Colonel-General Vladimir Kryuchkov, used the KGB's resources to help the August 1991 coup attempt to overthrow Soviet President Mikhail Gorbachev. On August 23, 1991 Colonel-General Kryuchkov was arrested, and General Vadim Bakatin was appointed KGB Chairman--and mandated to dissolve the KGB of the Soviet Union. On November 6, 1991, the KGB officially ceased to exist, although Russia's new national security organisation, the Russian Federalnaya sluzhba bezopasnosti (FSB), works in the same things that the Soviet KGB did.
Belarus is the only post-Soviet Union era country where the national security organization is still called "KGB". Belarus is where Felix Dzerzhinsky was born. Dzerzhinsky started a group called the Cheka, which was an organization that was started in the Soviet Union before the KGB was started and that was like the KGB.