AdvertisementFor America's Top Spy Catcher, A World Of Problems To Fix — And Prevent05:09Download AudioResumeDecember 20, 2016Mary Louise KellyfacebookEmailWilliam Evanina, the head of U.S. counterintelligence, estimates that more than 100 Russian spies are currently operating on U.S. soil. (Courtesy of the Office of the Director of National Intelligence)