Dixie, it that the one where the son testifies against his old man about his dealings in Chicago?
Yep wore a wire while in prison with him and got him to talk about murders he participated in. Eventually his Uncle also testified against his Dad as well.
I'm with you Binnie, I think it's horseshit the FBI would ask him to go to Mississippi where he would stand out like a huge sore thumb back then, to dig up info. I think that is pure b.s.