In AT&T Mobility v. Concepcion, U.S., No. 09-893, 4/27/11, an ideologically divided U.S. Supreme Court held that the Federal Arbitration Act (FAA) trumped California law to uphold class action waivers in arbitration. 

According to the majority opinion authored by Justice Antonin Scalia, a blanket prohibition on arbitration provisions requiring individual arbitration in favor of…