On a recent Friday night, John A. (Junior) Gotti, Jr., arrived at the Twin River Casino, in Lincoln, Rhode Island, north of Providence. The former crime boss, who led the Gambino family after his father’s conviction, in 1992, was not there to play craps or to catch the Rat Pack Christmas Show. (That’s not until later this month.) He had come for a mixed-martial-arts fight. His son, twentyfive- year-old John Gotti III, was making his professional début, on C.E.S. M.M.A. 46, a fight series sponsored by a Providence-based promoter called Classic Entertainment and Sports.
Gotti, Jr., who is fifty-three, looks like an accountant who spends most of his free time in the weight room. He wore glasses, a black tracksuit, and pristine white sneakers, and he carried a small leather…
