In the early 60's the CIA realized it was in a strange position: They had 2 KGB defectors, both of whom revealed important "secrets" from the other side, both of whom claimed to have "information" about the assassination of JFK and the KGB, and both of whom insisted that the other was a double-agent sent to discredit them. Was Yuri Nosenko the real deal, with his patently unbelievable assurances that the KGB had taken no interest in Oswald during his stay in Russia? Or was Anatoliy Golitsyn telling the truth, with his fantastical, delusional-sounding declarations that the KGB had engineered a 50-year plan to fake their own demise and then reassert themselves later? Were they both false defectors, sent to confuse the CIA into a state of paralysis? James Jesus Angleton, the CIA's head of counter-intelligence, a bony, socially awkward florist, believed Golitsyn. And so began the CIA's descent into the "wilderness of mirrors", and the ultimate collapse of American intelligence. In his time, Angleton was the CIA's master spy catcher. By the time of his forced retirement after multiple administrations, however, he'd ordered domestic spying on American anti-war citizens and set in motion a series of abuses that ended with the Church and Pike congressional hearings into the CIA's illegal activities. In his quest to catch spies he missed the biggest of all, when his long-time best friend and close working associate, British agent Kim Philby, turned out to be a career mole and defected to Russia. Angleton, personally betrayed and professionally humiliated, immersed himself in a quest to prove Yuri Nosenko a fraud. Though it doesn't come close to presenting the final verdict on the Nosenko / Golitsyn affair, Cold Warrior does go a long way toward explaining James Jesus Angleton. The witch-hunts he began (officially called HONETOL) "crippled" the CIA, in the words of operatives then and now. The careers of literally hundreds of innocent agents were permanently ruined, and virtually e-v-e-r-y subsequent defector from Russia was either rejected or never utilized, right up to the end of the Cold War. The end result of Angleton's subsequent paranoid breakdown was 40 years of paralysis and confusion on the part of the CIA. (It also caused the breakdown of the CIA's relationship with the FBI. J. Edgar Hoover thought Angleton was nuts. Think about that for a second.) As is revealed in former CIA agent Tennent Bagley's 2007 book Spy Wars, the CIA decided to treat both former KGB agents - when all evidence said one or both were false - as true. That kind of pathological, systemic unwillingness to examine its own failures was not the fault of James Jesus Angleton. Despite the conclusions of this fascinating and well-researched book, in the end it was the willingness of the agency to bury the affair in favor of its bureaucratic survival that truly crippled the American intelligence community and turned the CIA into a structural failure incapable of collecting intelligence, or predicting not just the terror attacks of 9/11, but the fall of the Berlin Wall, the end of communism in Russia, the rise of Putin, the fall of Saigon, the lack of WMD in Iraq, India developing the bomb...
FURTHER READING: "Legacy of Ashes: The History of the CIA" by Tim Weiner, "Wilderness of Mirrors" by David C. Martin, "Molehunt: The Secret Search for Traitors that Shattered the CIA" by David Wise, "Legend: The Secret World of Lee Harvey Oswald" by Edward Jay Epstein, "Burn Before Reading" by Admiral Stansfield Turner and "Spy Wars" by Tennent H. Bagley. None of these books will give you a clear answer to the Nosenko / Golitsyn affair or the terror it wreaked on the US intelligence community, but they will reveal the scope of utter confusion felt even today by intelligence experts still trying to sort the whole business out.
NC