The watchdog group says in a Thursday press release that's a bad idea because Rosemont has been trying to lure a casino for years amid allegations of possible mob ties.
Back in 2004, Attorney General Lisa Madigan questioned whether the suburb and its then-mayor, Donald Stephens, had ties to organized crime. Stephens has since died.
Rosemont spokesman Gary Mack says the village has been completely transparent in this latest process.
The commission also wants the Illinois Gaming Board to release more information as it works to select a licensee.