A new exhibition in Moscow has made public for the first time secret documents that British double agent Kim Philby sent to his Soviet handlers.
Considered one of the KGB's most productive Western recruits — and Britain's biggest Cold War traitor — Philby passed information to Moscow from the 1930s until he was discovered and fled to the Soviet Union in 1963. He died in 1988 at the age of 76.
Philby is still celebrated as a hero by the KGB's successor agency, the FSB, and Russia's foreign intelligence service, the SVR.
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