I have no way of knowing how accurate Joseph J. Trento’s 2001 book, The Secret History of the CIA, is, given the nature of the subject. However, I’ve been fascinated (and yes, horrified at times) by some of the historical figures dating back to WW2 that the author describes.
For example: Laventia Beria, head of the NKVD under Stalin, who apparently recruited and then dispatched the Soviet spy known as “Sasha” to infiltrate the Nazi military command during the war. Sasha succeeded in convincing a high-ranking Nazi general, Reinhard Gehlen, that he was a Russian anti-Communist who supported the German cause. Gehlen went on to position himself, near the war’s end, as a candidate for recruitment by the American intelligence community, and when the U.S. did recruit him and a bunch of other Nazi war criminals to join in the American spying effort against the Soviets, Gehlen brought Sasha with him. Sasha’s Soviet bosses then gave Sasha new orders to spy on the American spies, which he proceeded to do.