CHICAGO — This city's ban on gun shops violates the Constitution, a federal judge ruled on Monday, dealing the latest setback to politicians here who had put in place some of the nation's strictest limits on firearms. "The stark reality facing the city each year is thousands of shooting victims and hundreds of murders committed with a gun," the judge, Edmond E. Chang, of Federal District Court for the Northern District of Illinois, wrote. "But on the other side of... (GunPolicy.org)