On Newman: his last claim that I know of is that the Pentagon - Lansdale and Lemnitzer as leaders - killed JFK because he said no to a nuclear first strike against the USSR and PRC. There's nuts and then there's this level of nuttery.
Former high-level Army Intelligence Analyst and NSA officer Newman IS a "nut case" for believing that Sergei Papushin was a true defector (he wasn't), that Oswald was a Ukrainian (sic) KGB agent in Minsk, and that some high-level Army officers killed JFK because he refused to nuke Moscow and Peking in 1963. Regardless, in 1995, Newman discovered that the non-CIA cables about Oswald's defection (which I referred to in a recent post on this thread) hadn't been routed to where they should have gone (the Soviet Russia Division), but to the Office of Security (Where Bruce Leonard Solie* in the Security Research Staff's Branch Research section was the primary "mole" hunter for the entire Agency), and therefore that Solie must have known in advance that Oswald was going to defect to Moscow.
Around 2015 (iirc), Newman read the 2007 Yale University Press book, "Spy Wars: Moles, Mysteries, and Deadly Games," by Nosenko's former CIA case officer, Tennent H. Bagley, PhD, and became convinced that Nosenko had been a false defector sent to the CIA in Geneva in 1962 to discredit what recent true defector, Anatoliy Golitsyn, was telling James Angleton about possible KGB penetrations of the CIA, the FBI, and the intelligence services of our NATO allies. Newman's colleague, Malcolm Blunt, had become friends with Bagley at the 2008 Raleigh Spy Conference, and a couple of years later, Blunt, a habitue of the National Archives, showed Bagley some CIA documents that he hadn't been privy to in 1959-60. These documents led Bagley to conclude that Oswald must have been a "witting" defector, i.e., that the CIA had sent him to Moscow. What Newman has shown since then is that Solie sent (or duped his confidant, protege, and mole-hunting subordinate, Angleton, into sending) Oswald to Moscow in 1959 as an ostensible (i.e., fake-fake) "dangle" in a planned-to-fail hunt for "Popov's U-2 Mole" / "Popov's Mole" (Solie) in the wrong part of the CIA -- the Soviet Russia Division. Why would Solie have done such a thing? Answer: So that no one would look for a KGB "mole" in the Office of Security and so the Soviet Russia Division would be torn apart by the ensuing nine-year mole-hunt.
I think it's pretty impressive that a "nut case" like Newman can be sufficiently openminded to new evidence to be able to change his theory from "evil, evil James JESUS Angleton sent Oswald to Moscow on an evil, evil Deep State mission" to "the KGB sent Oswald to Moscow so that he could unwittingly help prevent its mole in the CIA, Bruce Solie, from being uncovered."
*Bruce Solie -- the dude who "cleared" KGB false defector Yuri Nosenko through a bogus polygraph exam and a specious report in 1968, the guy who betrayed CIA's spy, GRU Colonel Popov, to the Soviets and gave them the top-secret specifications of the U-2 spy plane, and the guy who helped another probable "mole," Leonard V. McCoy, "lose" CIA's spy Nicholas Shadrin to KGB kidnappers in Vienna in 1975.
PS You can read Bagley's book for free by googling "spy wars" and "archive" simultaneously. Ditto his 2014 follow-up article "Ghosts of the Spy Wars" by googling "ghosts of the spy war" and "archive" simultaneously.