I have already blogged about Jim Garrison's belief that Fred Crisman was perhaps behind the JFK assassination. But, Garrison also believed that Crisman was one of the three tramps, and that he was a grassy knoll assassin.
Here is a page from the files of Jim Garrison. His notation is at the bottom.
He writes: "This is possibly an important point. Some of the box cars (in which the "tramps" could have been found) really were very close to the arcade area. As a point of dispersed departure, these three men may in advance have dressed as tramps and, after the ambush, may have gone straight to the boxcars and become "tramps" laying there."
So, Garrison believed that the tramps may have been the assassins.
Some of the so-called experts that were advising Garrison believed that one of the tramps was Fred Crisman. Here is a letter that Richard Sprague, a photo expert, sent to Fred Newcomb, another photo expert. Sprague believed that Fred Crisman is one of the tramps. Newcomb did not buy Sprague's theory.
By the way, Richard Sprague was the person who brought the tramps to Garrison's attention (you can read the whole story in On The Trail of the Assassins).
Here's a letter Bill Turner wrote to Richard Sprague, confirming that Crisman was one of the tramps. Turner was a writer for Ramparts magazine and he also did investigative work for Garrison.
Garrison was convinced. His 1985 manuscript, A Farewell to Justice, contained a chapter on the tramps and Fred Crisman. Here is a summary of that chapter.
Ultimately, Crisman was taken out of Garrison's book. If you want to know more about that, you'll have to read my book On The Trail of Delusion - Jim Garrison: The Great Accuser.