George Blake

George Blake was a spy with Britain's Secret Intelligence Service and worked as a double agent for the Soviet Union. He became a communist and decided to work for the MGB while a prisoner during the Korean War. Discovered in 1961 and sentenced to 42 years in prison, he escaped from Wormwood Scrubs prison in west London in 1966 and fled to the Soviet Union. He was not one of the Cambridge Five spies, although he associated with Donald Maclean and Kim Philby after reaching the Soviet Union.