This series contains selected files from the First and Second World War periods and the inter-war years on suspected spies and double agents, renegades and suspected renegades (including P G Wodehouse), German intelligence (Abwehr) officers, Japanese intelligence agents, communist sympathisers and Soviet agents, and other groups in which the Security Service took an interest (including pacifist and anti-conscription groups).
Not every case listed resulted in a finding of guilt.
Please note: digital images of selected files from this series are available to download.