20 Cold War Spies Who Betrayed Their Nations

Anthony Blunt was an art historian, royal household adviser, and member of the Cambridge spy circle. During World War II, he served in MI5 while passing information to Soviet intelligence. British authorities obtained his confession in 1964 but granted immunity in exchange for cooperation, keeping the secret from the public for fifteen years. When Prime Minister Margaret Thatcher exposed him in 1979, Blunt lost his knighthood but never faced criminal prosecution for his espionage thereafter.