UNITED STATES – In a 5-4 decision, the U.S. Supreme Court recently held that classwide arbitration must be explicitly called for in an arbitration agreement to be enforceable. Specifically, the Court held that ambiguity as to whether the parties agreed to arbitration on a classwide basis cannot provide a “contractual basis” sufficient to compel class arbitration. Plaintiff Frank Varela filed the underlying lawsuit against his employer, Lamps Plus Inc., after a hacker gained access to…