@maddow Please check out Spy Catcher by Peter Wright, Senior Intelligence Officer at MI5. There were five moles in MI5 in the 20th century including the Head of MI5, Roger Hollis. He was never unmasked, although there was much circumstantial evidence, but the other four were .
@maddow Please check out Spy Catcher by Peter Wright. THe Russians had five moles inside MI5 during the 1920s, 1930s, 1940s, 1950s and 1960s including the head of MI5, Roger Hollis. It was never proven but there was a lot of circumstantial evidence. The other moles were uncovered.