That is why LBJ had JFK, Marilyn and RFK all knocked off with the tacit approval of Hoover...
I heard an interview of Johnson’s mistress of 27 years on a radio station in the mid-90’s. She said he had people killed, but it was just “business” and he was still a good man. Talked about a meeting at a hotel suite in Dallas the day before RFK was killed, with a number of men in suits. IIRC she said he told her after the men left, “after tomorrow, Bobby Kennedy won’t be a problem any more”. All those people (and the people who took their places) were evil. Power corrupts, and absolute power corrupts absolutely.