Four Iraqi citizens, who were seized by the U.S. military in the Iraq war zone and detained by the military in Abu Ghraib prison, near Baghdad, commenced this tort action against a civilian contractor, retained by the military to assist it at the prison in conducting interrogations for the purpose of obtaining intelligence. The plaintiffs allege that while they were detained, the contractor's employees and military personnel conspired among themselves and with others to torture and abuse them and to cover up that conduct...On the contractor's appeal, we reverse and remand with instructions to dismiss this case. We conclude that the plaintiffs' state law claims are preempted by federal law and displaced by it...