'The Manchurian Candidate' (1959) by Richard Condon

'The Manchurian Candidate' is a novel by Richard Condon, first published in 1959. It is a political thriller about the son of a prominent U.S. political family who is brainwashed into being an unwitting assassin for a Communist conspiracy.

Major Bennett Marco, Sergeant Raymond Shaw, and the rest of their infantry platoon are captured by an elite Soviet commando unit during the Korean War in 1952. They are taken to Manchuria, and brainwashed into believing Shaw saved their lives in combat – for which Shaw is subsequently awarded the Medal of Honor ... And then the horror starts.