The Eighth Chief Directorate - KGB (Soviet Union), the Committee for State Security, Komitet Gosudarstvennoy Bezopasnosti.
The Eighth Chief Directorate was responsible for the highly sensitive area of communications. The Communications Directorate was tasked with monitoring foreign communications. The Directorate was also responsible for the cryptological systems used by KGB divisions, the transmission of communications to KGB stations overseas, and the development of secure communication equipment.
After the collapse of Soviet Union, The Eighth Chief Directorate was reorganized into a separate agency - FAPSI.