How FBI paid $12m to unmask a traitor The FBI paid $US7 million ($12.7million) to a former Russian intelligence officer to smuggle out of Moscow a secret KGB file that unmasked a veteran FBI agent as a spy for Russia, according to a new book about the case. Although it was known that the FBI got the file from a Russian source, it was not known just how much it cost the bureau to find the agent, Robert Hanssen, or that the former KGB officer, whose name is not disclosed in the book, was secretly relocated to the United States....