Interesting talk by the biographer of Soviet spy Guy Burgess.
Near the end of the video he addresses a key question about the fall of the Cambridge Ring: Why did they use Burgess to save Maclean when that meant Philby would be caught in the blowback?
Lownie put that question to a former KGB man who answered that it did not matter because the Soviet Union "had so many spies" in the west that Philby and Burgess were expendable.
Maybe that was just braggadocio from an old guy who worked for the side that lost. There is, however, no getting around the fact that the KGB seemed to toss away two valuable spies for no good reason.
As Verne Newton put it: "Moscow did not gamble with Philby's future. They did not even sacrifice it. They threw it away."
The key point, it seems to me, is that Philby, Burgess, and Maclean were British spies with access to American secrets. That should have made them especially valuable. Yet, there is no denying that Moscow treated them with a carelessness bordering on contempt.
Something else to ponder:
Robert Lamphere, the FBI agent who was central to exploiting the VENONA breakthrough, wrote this in his memoirs:
Philby's indifference is particularly notable because he arrived in Washington a few months after Moscow lost a well-placed source within the DOJ who fed them valuable information about FBI counterintelligence (Judith Coplon).
I must admit that I initially doubted that Philby was an active Soviet spy. I reasoned that a real Soviet agent would have worked harder at establushning closer relations with me and other key people; I understood that Philby had concentrated on the CIA, which was certainly a KGB target, but why hadn't he taken the opportunity to penetrate the FBI as well? Since Philby hadn't spent much time on us, I temporarily concluded that he must not have been an active spy.
One possibility is that they were not seen as valuable at Dzerzhinsky Square. Perhaps the paranoid Stalinists who ran the spy agencies deemed the Cambridge Ring too good to be true, i.e. double agents.
Another possibility is that the KGB and GRU actually did have many active sources in London and Washington-- so many that they could afford to lose Philby and Burgess just to help Maclean avoid interrogation.
If this is true it requires a radical revision of the McCarthy narrative.
The first draft of history declared that there was never a communist underground in Washington; the senator was a demagogue who launched a witch-hunt. The revised (current) narrative holds that there were communist agents but Harry S. Truman and John E. Hoover had smashed the spy rings. McCarthy is still a demagogue who launched a witch-hunt.
If Lownie's source is correct, then that narrative is wrong. Soviet intelligence still had assets in place and the government was not doing enough to root them out.
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