KGB (transliteration of "КГБ") is the Russian abbreviation for Committee for State Security (Russian: Комитет государственной безопасности (help·info); Komityet Gosuarstvennoy Bezopasnosti), which was the official name of the umbrella organization serving as the Soviet Union's premier security agency, secret police, and intelligence agency, from 1954 to 1991. Then, the official name of this organization was changed to FSB (ФСБ, Федеральная служба безопасности), although the word KGB may apply to the secret police of various epochs.