"Supposedly, even AL Capone didn't want to mass with them. That's scarry."

Harold Nason was not afraid of them. He killed a member of the gang in eastern KY during a hijacking of a whiskey shipment and lived to tell it. Harold was an enforcer for Moe Daliz and the Cleveland syndicate.
You can read a little about it in one of my 5 part articles on the Arrowhead Inn that are posted on chequers.com.