The Committee for State Security (Russian; Комите́т госуда́рственной безопа́сности), abbreviated as KGB, was the main security agency for the Soviet Union until its collapse in 1991.
Androvich served as an operative for the KGB before becoming the Minister of Defense of Russia.
Following her graduation from the Red Room, Natasha Romanoff was recruited into the KGB. As a professional assassin, she served for KGB before she left to join S.H.I.E.L.D..
Yuri Zaikin served for the KGB before joining SVR and, later, HYDRA.
KGB managed to obtain a classified file with information on the mysterious assassin Winter Soldier. Romanoff managed to obtain this file from Kiev and handed it to Steve Rogers.
In chronological order: