Spilotro was implicated in the murders of Bill McCarthy and James Miraglia, known to the public as the "M&M Murders." There was a 70% increase in murders in Las Vegas following Spilotro's arrival. McCarthy and Miraglia were two young robbers who had robbed and shot dead three businessmen in the mobster populated neighborhood of Elmwood Park, near Chicago. They were also in debt to Anthony's old boss Sam DeStefano. Their bodies were discovered on May 15, 1962, in the trunk of a car dumped on the Southwest Side of Chicago. Both had been beaten badly and had their throats slit. From McCarthy's injuries, it seems his head was placed in a vise popping out his eye, presumably to persuade him to disclose the whereabouts of Miraglia.
http://en.wikipedia.org/wiki/Anthony_Spilotro
Yeah, Spilotro was a real sweetheart- why do you contend he got a "bad rap" in the movie? He may not have been as crazy as portrayed, but he was certainly an extremely violent thug.