Sprint Spectrum L.P. v. Hesse

(1) Whether a federal court may review a state court judgment approving a class settlement where the state court did not explicitly address each specific claim that a class member might release as part of the settlement; and (2) whether a federal court may nullify state court rules, requiring class members to opt out of a proposed state class settlement, by permitting the class members to maintain a subsequent federal action asserting claims released by the state class settlement from which the class members chose not to exclude themselves.