What if the federal court issued a temporary approval of the nationwide class action settlement that had been approved by the federal government?

In addition, the temporary approval of the nationwide settlement stayed the state class actions. The federal court had the power to issue an injunction against continued state proceedings under the All Writs Act, 28 U.S.C. 1651 ("[t]he All Writs Act ... empowers the federal courts to enjoin state proceedings that interfere, derogate, or conflict with federal judgments, orders, or settlements." Keith v. Volpe, 118 F.3d 1386, 1390 (9th Cir.1997)) and the Anti-Injunction Act, 28 U.S.C. 2283 (a federal court may intervene and enjoin state court proceedings in three narrow circumstances, one of which includes when it is necessary to protect the court's jurisdiction). Although comity requires federal courts to exercise extreme caution in interfering with state litigation, federal courts have the power to do so when their jurisdiction is threatened.