William "Guy" Banister
Guy Banister was a suspect of New Orleans Prosecutor Jim Garrison and former FBI Special Agent. He aided anti-Castro exile Sergio Arcacha Smith in forming the small exile organization The Friends of Democratic Cuba. He also was frequently in contact with former New Orleans suspect David Ferrie.
Despite varied previous official declarations and statements, Central Intelligence Agency documents offer Guy Banister was a CIA informant and member of the Friends of Democratic Cuba.