Cover page of newly released MI5 file KV3-448 (UK National Archives).
The MI5 bugs that recorded conversations at King Street were invaluable for cross-referencing the movements and opinions of hundreds (if not thousands) of unwary visitors to the CPGB HQ.
The MI5 bugs that recorded conversations at King Street were invaluable for cross-referencing the movements and opinions of hundreds (if not thousands) of unwary visitors to the CPGB HQ.