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 Richter filed an appeal which was, after much discussion in the Security Service, rejected. Faced with his imminent execution, Richter wrote a letter to one of the MI5 officers: "You can rely upon it that I shall not be less brave than Jakobs; I too will know how to die, yet not as a Nazi spy on your gallows, but as a man." On 10 December 1941, Richter was hanged at Wandsworth Prison. A procedure that normally took around 15 seconds, took over 17 minutes. When Albert Pierrepoint, the executioner, entered Richter's cell to bind his wrists, Richter charged at