John Cairncross

John Cairncross was a British intelligence officer and academic who is best known for secretly acting as a double agent during World War II. He worked for the British government but also passed sensitive information to the Soviet Union, making him part of the group known as the "Cambridge Five" spies. His actions helped the Soviets gain valuable insights during the war, impacting Allied efforts. Cairncross’s espionage was kept secret for many years, and his role remains a notable example of Cold War intelligence conflicts.