“[The] single, simple, self-evident explanation is that the enormous act of defection, of betrayal, treason, is almost invariably the act of a warped, emotionally maladjusted personality. It is compelled by a fear, hatred, a deep sense of grievance, or obsession with revenge far exceeding in intensity these emotions as experienced by normal, reasonably well-integrated and [...]

Graham Greene, an Mi6 correspondent during his days in Lagos, wrote that “espionage today is really a branch of psychological warfare. The main objective is to sow mistrust between allies in the enemy’s camp… The real value of the two scientists [Fuchs and Nunn May] to the Soviet was not from their scientific information but [...]

From a FOIA-released WWII training manual for special officers: Cover A: General Freedom – financial – social – movement – leisure. B: Essential details Name – history – documents – clothes – behavior (money-associates-tastes-local conditions-table manners-slang-mannerisms). iv. Coming down to business – change your line of appeal to suit the case, eg for a priest, [...]