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Existing comment: The Fourth Man: Art Advisor to the Queen
Anthony Blunt led two lives -- renowned art historian and Soviet spy. His book Art and Architecture in France remains a classic. Yet as an MI5 (British counterintelligence) officer during World War II, he betrayed the identities of all of his colleagues to Moscow. When MI5 learned of his espionage in 1964, Blunt (codename: Tony) confessed and in turn obtained immunity from prosecution. In 1979, he was publicly identified as a Soviet spy and stripped of his knighthood. Four years later, Blunt died in London. In his posthumously published memoirs, he called his decision to spy for Moscow "the biggest mistake of my life."
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