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As Soviets approached Auschwitz, Hitler's elite guard, the SS, forced around 60,000 prisoners there - mostly Jews - to move further west.

Shortly before the end of the war, Philby was promoted to head of MI6's anti-Soviet section - meaning he was in charge of running operations against the Soviets while operating as a KGB agent.

He also worked on arms reductions with the Soviets.

Others say that in attempting to shore up support against the Soviets, the US set the course for China's rise and ended up creating one of its greatest rivals.

It was the only time in Olympic history that the United States had boycotted an Olympics; the Soviets responded by boycotting the 1984 Summer Games in Los Angeles.