18 U.S.C.A. § 1084 makes it illegal to transmit wagering information by interstate means. It is basically Congress's way of making gambling illegal. You can receive up to two years in prison for this.
Ohio outlaws much gambling and has a gambling crime called cheating which includes "Engag[ing] in conduct designed to corrupt the outcome of an athletic or sporting event." If the cheating is for more than five hundred dollars it is a fifth degree felony and a higher degree of felony for subsequent offenses.
Further, Dongahy may be in trouble for racketeering (I haven't been following the story, so I don't know what the charges are). Finally, I think it is perfectly sensible for him to be jailed. He is basically fraudulently acquiring money for himself or others because of his ability to influence the outcomes of games. This is theft and fraud which are illegal in every state I hope.
Anyway, that's all the research I'm doing on the NBA. I think it the worst of the professional sports organizations at the moment which is why I'm becoming more of a hockey fan every year. Boo! NBA.