Whittaker Chambers
This Communist turned conservative was young when he encountered the ideology of Communism. He was instantly intrigued, because he felt disenfranchised by world politics following WWI and WWII. He felt a tremendous connection to the suffering of the German people, but later in life, his testimony revealed that the Russians hired him as a spy, and that the US government had been infiltrated by Russian intelligence.
Colonel Bykov
When Chambers reveals the operational flow for Russian espionage, he says that this man, Colonel Boris Bykov, the head of the Communist party, was his connect to Russian intelligence. So, Chambers would have meetings with Russians where he would send Bykov intelligence that he gleaned from his sources.
Alger Hiss
This was by far the most controversial reveal of the House Un-American Activities Committee hearings. Chambers says that Hiss is a Communist, and that he was one of his spies, but Hiss denies it and sues him for libel. In response to the suit, he manifests hidden evidence that condemns Hiss—the famous "Pumpkin Papers." Hiss was the assistant to the Assistant Secretary of State, so he had access to top-level government information.
