Josef Jakobs SW3, on 4–5 August 1941. The trial was held "in camera" because the German agent had been apprehended in a highly classified intelligence operation known as the Double Cross System. The British were aware that Jakobs was coming because his arrival information had been passed on to MI5 by the Welsh nationalist and "Abwehr" double agent Arthur Owens. After a two-day trial which involved hearing the testimony of eight witnesses, Jakobs was found guilty of spying and sentenced to death. Jakobs's execution took place at the miniature rifle range in the grounds of the Tower of London on 15 August
Karel Richard Richter Jakobs, who was sent to Britain on 31 January 1941. Unlike Jakobs, who was to report on the weather in Britain, Richter had a very specific mission, to check on Wulf Schmidt, a German spy working out of Britain. The Germans suspected that Schmidt (known as Agent LEONHARD) had been turned into a double-agent by the British, which in fact he had, being known to the British as agent TATE. Richter parachuted into Britain on the early morning of 12 May 1941, landing near London Colney north of London. Richter quickly hid his parachute and equipment and spent the next