KGB

The KGB was the Soviet Union's security agency in the later half of the 20th century.

In 1951, the KGB was headed by Lavrentiy Beria. (PROSE: Endgame)

Yuri Andropov was the head of the KGB who ordered the interment and incineration of Adolf Hitler's remains on 5 April 1970, in a project called Operation Archive. (PROSE: The Shadow in the Glass)

Yuri Azarov was running a KGB network in Prague during the latter half of the 20th century. He was using the Golem of Prague as an enforcer. (COMIC: The Broken Man)

Anatoly Yugorovich Portnoy was a KGB agent before the fall of the Eastern Bloc, after which he became an oligarch. (AUDIO: Rogue State)

The KGB had many files on the Master. (AUDIO: And You Will Obey Me)

Behind the scenes
In the real world, the KGB was formed in 1954, one year after the real Lavrentiy Beria's execution. Beria headed the KGB's predecessor, the NKVD.