Here is a letter that Garrison wrote to Arch Kimbrough, another JFK assassination researcher:
James Dondson was the man who was with Clay Shaw during the weekend of the assassination. Was there a second Dondson?
"The problem is that these curious CIA types -- such as Ferrie, Bradley and Beckham -- have made themselves part of odd religions or extreme right-wing groups, and sometimes a combination of both. In most instances, however, their history in intelligence work for the federal government pre-dates their identification as right-wing individuals, so that there exists a very real liklihood [sic] of a pattern of CIA penetration of such organizations as a protective cover."
David Ferrie, Edgar Eugene Bradley, and Thomas Beckham had no CIA connections.
"David Lewis came in and gave us some further information regarding the United Cuban Missionary Force Beckham attempted to found, and Beckham's self-styled (to Lewis) membership in the CIA. I wrote up memo on Lewis' remarks. After Beckham emerged from the grand jury, Alcock was mocking the idea that anyone could believe (as Garrison does) that "a bum like that" would be working for the CIA."
On the third page of his letter, Garrison writes:
"We have now identified one who was flown to Arlington, Virginia three days after the assassination, and this particular individual played a very important role in helping to set Oswald up."
Garrison is referring to Kerry Thornley who left New Orleans after the assassination. He took a job as a doorman in an apartment building.
Kerry Thornley testified before the grand jury in February 1968. He had a standing offer from a friend to stay in Virginia and he felt the time was right.
Garrison tries to make this sound suspicious in his book On the Trail of the Assassins:
"I later sent Andrew Sciambra to the Washington area, where he traced Thornley's path. Thornley had wound up at Arlington, a Washington suburb, and had moved into Shirlington House, a first-class apartment building where he worked as a doorman. Thornley stayed at Shirlington House for six months, until he testified before the Warren Commission. Oddly enough, his salary was less than the rent of his Shirlington House apartment."
Of course, the great investigator Jim Garrison could not figure out that Thornley's room and board were part of his doorman gig. All he had to do was to ask Thornley.