Latino groups are challenging the city of Hazleton, Pa.'s recent crackdown on illegal immigrants. The Puerto Rican Legal Defense and Education Fund filed a lawsuit on Tuesday, the first in the nation against a city that has passed an illegal immigration ordinance. The group and other plaintiffs contend the measure is illegal, and they are asking a federal judge to prevent its enforcement. Hazleton's illegal immigrant ordinance is one of the toughest of its kind in the United States. It imposes $1,000 fines on landlords who rent to illegal immigrants, denies business permits to companies that give them jobs, and...