Battle Mask (The Executioner, #3) by Don Pendleton

If you like action-adventure stories, then the Mack Bolan "Executioner" series is for you. This episode has Mack Bolan infiltrating the Mafia in a very deep cover, and working his usual Mafia-defeating magic in his usual action-packed way. More non-stop action than most readers can handle. Awesome story. Go get it!