WASHINGTON - More than 1,200 people were arrested in meatpacking plants in six states during raids that federal officials said amounted to the largest-ever workplace crackdown on illegal immigration. Homeland Security Secretary Michael Chertoff said Wednesday the investigation uncovered a "disturbing front" in the war against illegal immigration, in which illegal immigrants are using the identities of U.S. citizens to obtain jobs. "Violations of our immigration laws and privacy rights often go hand in hand," he said. "Enforcement actions like this one protect the privacy rights of innocent Americans while striking a blow against illegal immigration." The raids at Swift...