Destiny Betrayed, writes: (page 208) This collection by attorneys Bill and Ed Wegmann includes a report by Wackenhut - a detective agency the Wegmanns hired - of an interview of a secretary who worked for attorney G. Wray Gill. Gill had employed David Ferrie as an investigator on some of his cases, including his work for Carlos Marcello. This secretary, named Sandra Anderson, told the detectives that she had seen a photograph depicting Shaw with Ferrie.
DiEugenio s source is
Probe Magazine, Volume 4 Number 8, page 8, which is not very helpful, since many issues are not online, In this case, that article is now online and page 8 does indeed give us more information: