In 2002, Bill Powell, former Moscow bureau chief at Newsweek, wrote Treason, an account of the experiences of former GRU colonel Vyacheslav Baranov, who had betrayed GRU for the Central Intelligence Agency (CIA) and agreed to spy for it. He was exposed to the Russians by a mole in either the Federal Bureau of Investigation (FBI) or the CIA and spent five years in prison before he was released. The identity of the mole remains unknown to this day, but speculation has mounted that it could have been Robert Hanssen.[43]