The Комите́т госуда́рственной безопа́сности, or Komitet Gosudarstvennoy Bezopasnosti, abbreviated as КГБ or KGB, and translated in English as the Committee for State Security, was the main security agency for the Soviet Union until its collapse.
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In the wake of S.H.I.E.L.D.'s collapse, many files were declassified which contained information about both S.H.I.E.L.D. and HYDRA. One of these was produced by the KGB, and had information on the Winter Soldier. Natasha Romanoff was able to obtain the file, which was being stored in Kiev, and handed it to Rogers so he could find more about what his friend went through at the hands of HYDRA, and where he might have headed following his defection from the terrorist group.
Rosalind Price compared what she saw as Phil Coulson's tactics of intimidation, having staked out her route home, to the KGB, only for Coulson to point out her own experience in working with Russian counterintelligence.
- In the comics, Georgi Luchkov was a KGB agent.