Federal Counterintelligence Service
The FSK (Federalnaya Sluzhba Kontrrazvedki (Федера́льная Слу́жба Контрразве́дки), Federal Counterintelligence Service) was a state security organization, initially of the USSR, and, after its dissolution, of the Russian Federation. The FSK was the successor organization to the KGB. It existed from 1991 to 1995, when it was reorganized into the FSB.
The KGB was dissolved when its chief, Colonel-General Vladimir Kryuchkov, used the KGB's resources in aid of the attempted coup of 1991 to overthrow 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. On November 6, 1991, the KGB officially ceased to exist.
 Directors of the FSK
- Viktor Pavlovich Barannikov 1991 – July 1993
- Nikolai Mikhailovich Golushko July 1993 – February 1994
- Sergei Vadimovich Stepashin February 1994 – June 1995
 Restructuring into FSB
The FSK was reorganized into the FSB (Federal'naya Sluzhba Bezopasnosti Rossiyskoi Federatsii (Федера́льная слу́жба безопа́сности Росси́йской Федера́ции) Federal Security Service of the Russian Federation) by the Federal Law of April 3, 1995, "On the Organs of the Federal Security Service in the Russian Federation", making the new FSB a more powerful organization.
- Gevorkian, Natalia (January 1993). The KGB: "They still need us". "Bulletin of the Atomic Scientists". pp. 36–39.