RENO -- Citing the potential of tainting the jury, a state court judge is telling prosecutors not to refer to the Hells Angels or Vagos as motorcycle gangs during an upcoming murder trial stemming from a fatal shootout between the rivals at a northern Nevada casino.

Washoe County District Court Judge Connie Steinheimer said Tuesday that referring to the entities as outlaw gangs could deny defendants a fair trial.

But the judge also warned defense lawyers not to emphasize that Hells Angels are formally incorporated in the U.S. as the Hells Angels Motorcycle Club.

Trial is set to begin July 22 in Reno. It stems from a September 2011 shooting that that killed the president of the Hells Angels' San Jose, Calif. chapter at John Ascuaga's Nugget in Sparks.