Mixed on this. The Manhattan Project was completed w/ no whistles. I have an FBI uncle w/ a career that put him in high places. He went looking into all kinds of stuff. JFK, RFK, MLK, lots of local gangsters, and everything was so compartmentalized that he only got glimpses of what went on. He was under a threat of death that extended to is family, ours, and all his friends if he spilled the beans.
My JFK theory aligned with his. I would see him a few times a year and always sprung a JFK scenario on him. Then I would study his reaction. Lots of swings and misses. Then, in passing, he told me a story w/ a moral to it. That was a clue. 'Think in straight lines and simply' was my takeaway lesson. The last time I brought JFK up, he said, "This is the closest you will ever get." Never mentioned it again. Quizzed my cousins. They have the same theory.
He did say a lot about RFK's murder. He was at the Ambassador Hotel the day after, on a case unrelated. Said it was a pro hit with full auto fire, maybe two hitters, and that members of RFKs security detail were 'turned' to turn him into the fire zone. Uncle John explained that security moves like a football play. The way it was set up only took two men out of position to change the nature of the protection.
He was in that stairwell/kitchen area 20 hours after the event. Walls were being patched up to disguise automatic weapon fire. A Senator who he was flying back with said, "If people knew, the nation would be set on fire." This fits with an America undergoing societal upheaval. Fear is a strange thing. Still don't know who, and why.
Wow, I'm gonna print this and put it in the family history file.