Have you read CIA 1035 960?
This part got an audible "Heh" out of me though: "Note that Robert Kennedy, Attorney General at the time and John F. Kennedy's brother, would be the last man to overlook or conceal any conspiracy." Robert Kennedy was murdered one year after this document was written, while running for president. Suppose he secretly doubted the Warren Commission's report (as has been claimed by some of the people close to him, but disputed by others), becoming president would have given him a uniquely privileged position from which to assail it.
No one (the public) had heard that term before the CIA got US media writing propaganda pieces to disparage inquiry into the assassination. It wasn't about the theories. It was about defining a group of theorists and creating ways to dismiss them. That continues to this day in yearly exercises of establishing mainstream credibility where young "journalists" help us all understand the broken psychology of people who want the world to be scary.
Honestly, if you have ever tried hard to advance a line of thought that's dangerious to the establishment you'd maybe be personally familiar, as I am, with the smell of counter-intelligence. But I can't cite a web link that would make that credible. And you've already learned to discredit anyone calling themselve a truther.
It worked. I'm saying it worked because it works on me. No amount of facts or scope or wisdom makes mainstream friends of mine more open to reality. Reality is scary. Disagreeing with the 'news' is scary. But US industry gatekeeps history and I refuse to be naive.