Oleg Gordievsky
Oleg Antonovich Gordievsky (Russian: Олег Антонович Гордиевский), CMG (born 10 October 1938 in Moscow, Russian SFSR, Soviet Union), is a former Colonel of the KGB and KGB Resident-designate (rezident) and bureau chief in London, who was a double agent of the British Secret Intelligence Service (MI6) from 1974 to 1985.
Read more about Oleg Gordievsky: Early Career, Double Agent, Life in The UK, Publications