How Much Did Clay Shaw's Attorneys Know About HIs CIA Connections?

 In my biography of Shaw, Man of a Million Fragments: The True Story of Clay Shaw, I discuss this issue in some detail, but without ever finding the complete answer(s). Irvin Dymond's paralegal received a call from a mysterious caller in September 1967, shortly before Shaw's trial was initially supposed to begin (it was subsequently delay until January 1969). The caller indicated that he and Shaw had been recruited to work for the CIA in 1948-49. It was all rather vague and mysterious, including the name of the CIA person by whom they were contacted (a Mr. Bertram, interestingly enough, given that the name Clay Bertrand had been in the news for over six months). I know that William McFadden Duffy, the publicity man with International House, is also mentioned in a 1954 CIA document as being a contact in the same mention with Shaw, but I don't know if Shaw or Duffy knew that the other man was a contact.

Anyone have any thoughts on this, other than speculation?