Immigration agents this week conducted their first work-site raid since President Barack Obama took office, but it was news to their boss, Homeland Security Secretary Janet Napolitano, who on Wednesday ordered a review of the action. Workplace raids involving the arrests of hundreds of illegal immigrants at a time became almost routine in the last years of the Bush administration, but Napolitano's response to Tuesday's raid at a Bellingham, Wash., manufacturing plant highlighted the Obama administration's much different approach to a hot-button issue. Napolitano told lawmakers during a hearing in Washington, D.C., on Wednesday that she did not know about...