Perhaps the most disruptive incident involving counterintelligence was James Jesus Angleton's search for a mole,[19] based on the statements of a Soviet defector, Anatoliy Golitsyn. A second defector, Yuri Nosenko, challenged Golitsyn's claims, with the two calling one another Soviet double agents.[20] Many CIA officers fell under career-ending suspicion; the details of the relative truths and untruths from Nosenko and Golitsyn may never be released, or, in fact, may not be fully understood. The accusations also crossed the Atlantic to the British intelligence services, which also were damaged by molehunts.[21]