The immigration raids on meatpacking plants in six states were the largest sweep of their kind against a single company and resulted in the arrests of 1,282 suspected illegal immigrants, Homeland Security Secretary Michael Chertoff said yesterday. The raids early Tuesday of facilities owned by meatpacking giant Swift & Co., based in Greeley, Colo., were followed by immigration charges against 18 percent of the 7,250 workers scheduled to work the morning shift, Immigration and Customs Enforcement officials said. More than 100 people were charged with crimes that included identity theft, Chertoff said, and that number is expected to grow. Federal...