In a 5-4 decision of AT&T Mobility LLC v. Concepcion, No. 09-893 (April 27, 2011), the U.S. Supreme Court held that arbitration agreements in standard form contracts that waive the right to pursue a class action are enforceable, and that the Federal Arbitration Act, 9 U.S.C. § 1, et seq., preempts a California court ruling to the contrary.