In the late 70s early 80s when the Philadelphia Mob was at its peak, the Don Angelo Bruno organized the perfect hit.
He would have the hitman kill the guy, 2 diggers make a hole. They would get the body from the hitman and drop the body off at the whole. 2 "movers", that were specially chosen, would then pick up the body, fill the whole with dirt, and take the body somewhere else where it would be buried.
Say the authorites thought of accusing the hitman. No body = no proof. Say somehow the 2 diggers were accused and they fessed up. When they went to the hole, there would be no body. The only people who knew were the people who moved the body and the Don, and they wouldn't sell out. Crime was never figured out.
Pretty damn clever. He put Atlantic City on the map too.