Pseudonym: Casasin, Thomas B
The memo is communication between Agency officers using the pseudonyms Thomas B. Casasin and Walter P. Haltigan, they discuss the defector Lee Harvey Oswald and his strange behavior in the Soviet Union. Casasin admits considering Oswald for use as a source of intelligence because he accessed locations of interest to Agency officials but further notes that he decided against it because of Oswald's strange behavior.
This document offers an interview of Casasin by House Select Committee staffer Surrell Brady that was conducted in France to learn of his interest regarding Oswald during the alleged assassin's defection period. During the interview, Casasin is established to have been an American citizen who left the United States for European assignments and he denies official interest in using Oswald despite his prior admissions.
This later release of the Casasin memo has writing upon it from officials that reveals the identity of Thomas B. Casasin as Jacques G. Richardson. Richardson was a CIA officer who used non-official media and diplomatic cover in his official duties and later retired with his family to France.