AI version:

J. Kenneth McDonald served as the Chief Historian of the Central Intelligence Agency from 1982 to 1996.

During his tenure, he helped establish the CIA Historical Review Program and oversaw declassification, internal research, and the creation of official, in-house histories of sensitive intelligence operations.

Background and Academic Career Education: He earned his doctorate from Oxford University.

Teaching: He taught at George Washington University and held the King Chair of Maritime History at the U.S. Naval War College.

Military: He was a veteran of the U.S. Marine Corps.

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I trust J. Kenneth McDonald's description of Shaw as a "highly paid contract source."

See JKM's credentials above. McDonald was not a leftie or soured socialist or Jew-hater. He had enormous experience in matters CIA, and in fact, worked as the CIA's historian, and wrote those words in an initially classified CIA document.

Fred Litwin does a lot of good work but flubbed it on JKM and Shaw.

.....
Garrison met with "Saturday Evening Post" writer James Phelan in Las Vegas on 3/05/67 and told him that Shaw had masterminded a Loeb-and-Leopold-like "homosexual thrill-kill" assassination of JFK.

After he received the "L' Humanite article," Garrison changed his theory against Shaw to "He organized the assassination for the CIA!!!"

https://www.latimes.com/archives/la-xpm-1997-sep-10-mn-30846-story.html
James Phelan; Investigative Reporter, Author - Los Angeles Times
Sep 10,. 1997 · “He was a dying breed,” writer Patricia Lambert, a close friend, said of a man the New York Times once called one of the country’s best investigative reporters

.....
This investigation was entirely unrelated to events in the United States or the assassination of John F. Kennedy. It was fortuitous that the CIA front organizations in Italy that emerged from CIA plans to overthrow the Italian government included Centro Mondiale Commerciale and Permindex, of which Clay Shaw was a director in New Orleans.

Jim Garrison was well on the trail of Shaw and his role as a CIA handler of Lee Harvey Oswald before Paese Sera published its series of articles.  When I sent them to Garrison, he had already charged Shaw in relation to the murder of Kennedy. Jim found the Paese Sera series confirmatory and important, but the articles were not admissible as evidence in court.

[...]

. . . . . .


My comments:

Garrison charged Shaw on the same day he arrested him, 1 March 1967.

The "Paese Sera" article was published on 4 March 1967.

Richard Billings wrote in his diary on 16 March 1967 that Garrison had received “a copy of a French newspaper (L’Humanité) article that supposedly mentions Shaw’s work in Italy.”

The "L' Humanite" article had been translated into English for Garrison and was based on the "Paese Sera" article.

Garrison met with "Saturday Evening Post" writer James Phelan in Las Vegas on 3/05/67 and told him that Shaw had masterminded a Loeb-and-Leopold-like "homosexual thrill-kill" assassination of JFK.

https://www.findagrave.com/memorial/69124634/harold-ferdinand-ziegler
Husband of Virginia Moore
Father of Mrs. George Massey and Harold F. Ziegler, Jr., both of Quincy, FL; Mrs. Jim Garrison, New Orleans; Mrs. William Eckert of Yokahama, Japan.
Brother of Mrs. William (Adrienne) Riddick and Mrs. Harry Raworth of New Orleans, and the late Charles, Gordon, and Alfred.