BRIDGEPORT, Conn. -- An immigration crackdown has led to the arrests of several illegal aliens working for subcontractors at Sikorsky Aircraft in Stratford. Seven suspects, five men and two women, were brought into U.S. District Court shortly before 9 p.m. Tuesday, charged with misusing Social Security numbers and having false alien registration cards. ... the seven were turned over to the U.S. Immigration and Naturalization Service. The seven work for subcontractors ... All had obtained security clearance badges by allegedly using false information, authorities said. As a result, they had access to classified areas and possibly sensitive materials. However, none...