Try traitors. A small, but well publicized, group of American PoWs refused rapatriation after the war. Call it brainwashing or what you will. At least a couple are there to the present day.
Talk about "be careful what you wish for...":
Joe Dresnok: An American In North Korea
Bob Simon Reports On The Last U.S. Soldier Still Living In North Korea
http://www.cbsnews.com/stories/2007/01/25/60minutes/main2398580.shtml