[appeal2]

J. Eddgar Hoover was owned by the Mob. It is well documented that he had extensive dealings with Frank Costello.

[justshutupandtakeit]

One of his informants, Jose Aleman, told the Bureau of the comments Santos Traficante made stating that JFK was going to be "hit." Others told of the threats from Carlos Marcello, a Costello protege. Hoover ignored them all.

While I don't think Hoover set it up, I do believe he knew what was going to happen, let it, then covered it up every way he could.