Werner Alfred Waldemar von Janowski,, was a captured German Second World War Nazi spy and the Royal Canadian Mounted Police's first double agent. He is believed to have been a triple agent by some, underscoring the RCMP's inexperience in espionage. Due to power struggles between the Canadian and British intelligence agencies during the Second World War and the RCMP's inexperience, Operation Watchdog was a failure. Janowski provided little significant intelligence to the Allies: no Abwehr agents were arrested and no U-boats were captured, despite his apparent cooperation. Within a year the operation was shut down and Janowski was sent to a prison in Britain.

Camp 020 at Latchmere House in southwest London was a British interrogation centre for captured German agents during the Second World War. It was run by Lieutenant Colonel Robin "Tin Eye" Stephens. Although other wartime interrogation centres were alleged to have used torture to extract confessions, Stephens denied claims that torture had been used at Camp 020. His instructions for interrogators ordered: “Never strike a man. In the first place it is an act of cowardice. In the second place, it is not intelligent. A prisoner will lie to avoid further punishment and everything he says thereafter will be based on a false premise.”