George Blake ( Behar; 11 November 1922 – 26 December 2020) was a spy who worked for Britain's Secret Intelligence Service (MI6) and became a double agent for the Soviet Union. Captured during the Korean War, he was imprisoned by North Korean forces and became a communist, deciding to work for the Ministry of State Security (MGB). Upon returning to the United Kingdom, he resumed work with MI6 while secretly passing classified information to the Soviets, betraying dozens of agents working on the eastern side of the Iron Curtain. Wikipedia
Who is popular today?