I figure that the local Mafia in Sicily had some part in facilitating the US Army landing. They desperately needed to get rid of the fascists so the group could have been used by the American Army to conduct warfare with guerilla tactics prior to the landing. Not necessarily some big stuff, but small things that made the landing easier for the US Army. I´m no warfare expert, but using a friendly group for these kind of purposes, secretly within a country before invading it, sure helps the invadors. But I´m doubtful that any of the American Mafia bosses had any part of this. The Americans had secret agents operating in Sicily during the world War 2. Most likely (IF there was a collaboration between the American Army and the Sicilian Mafia) these agents instigated the use of the Mafia.