Cryptonym: AMKIRK-1
Bill Simpich, State Secret, Chapter 6, http://www.maryferrell.org/pages/State_Secret_Chapter6.html
Both (Castro's aide Celia) Sanchez and (Dallas import-export agent Ramon) Cortes were close to Maria Witoski, also known as AMKIRK-1. Witoski was the estranged wife of Rene Vallejo, Castro’s closest aide who had been negotiating the possible rapprochement between Castro and JFK for the last several months.
104-10266-10026: FOLDER ON COBB, VIOLA JUNE (VOL VII)
1959: "(June Cobb) never dealt with Castro directly, but through Maria Witoska, who was (Celia) Sanchez's liaison with the PM's office."
104-10218-10384: TESTIMONY OF VIOLA JUNE COBB
3/30/62: June Cobb/AMUPAS-1/LICOOKY-1 testified to the Senate Internal Subcommittee on Security (SISS) about Maria "Witowska", married to Castro's #1 aide Rene Vallejo.