A federal appeals court ruled Thursday that Hazleton, Pa., may not enforce its crackdown on illegal immigrants, dealing another blow to 4-year-old regulations that inspired similar measures around the country. The 3rd U.S. Circuit Court of Appeals in Philadelphia said that Hazleton's Illegal Immigration Relief Act usurped the federal government's exclusive power to regulate immigration. "It is ... not our job to sit in judgment of whether state and local frustration about federal immigration policy is warranted. We are, however, required to intervene when states and localities directly undermine the federal objectives embodied in statutes enacted by Congress," wrote Chief...