I've read several accounts of Marcello's method, mostly used on underlings (made, not made, didn't matter) who he felt were skimming. They convened every Sunday morning to pay him his weekly percentage and those he felt were not giving him his due were detained for "questioning." If they didn't give satisfactory evidence to the contrary, they would be dispatched, strangled or shot, often by him personally, then dissolved in lye and dumped in the swamp. Since he lived on a 6400 acre swamp, he had plenty of room.