Class action arbitration is such a departure from ordinary, bilateral arbitration of individual disputes that courts may compel class action arbitration only where the parties expressly declare their intention to be bound by such actions in their arbitration agreement, the U.S. Supreme Court has ruled in a 5-4 decision. Lamps Plus, Inc. v. Varela, No. 17-988 (Apr. 24, 2019). The Supreme Court said, “Courts may not infer from an ambiguous agreement that parties have…