He was prosecuted by Sir Hartley Shawcross, and was convicted on 1 March 1950 of four counts of breaking the Official Secrets Act by "...communicating information to a potential enemy."
Sör Hartley Shawcross tarafından dava açıldı ve “bilgileri potansiyel düşmana verme” ile Official Secrets Act kanununu çiğnemesinden dolayı 1 Mart 1950’de mahkemeye çıktı.