Since you brought it up, I’m unconvinced the introducing crack to black neighborhoods thing is entirely related. Pretty sure the CIA already had their hands full with a couple war(s) to take a huge interest in MLK when he was rallying against racism, it was more until he started speaking out for unions and against unchecked capitalism. During the social justice years they only smeared him with the out-of-context details of his extramarital affair to media outlets (TMZ level bullshit) in order to try to discredit him. Don’t get me wrong, he was a nuisance to them for exposing injustice but as soon as you get in the way of the dynastic wealth of very powerful families though, it’s a whole new ballgame. That’s when the assassination talks probably kicked into high gear.