(Reuters) - A U.S. appeals court on Wednesday tossed out a judge's order that required Amazon.com to refrain from firing union supporters amid a nationwide organizing campaign at its warehouses.

A three-judge panel of the Manhattan-based 2nd U.S. Circuit Court of Appeals said the judge who issued the order at the request of the National Labor Relations Board failed to explain why such a sweeping mandate was necessary.

(Reporting by Daniel Wiessner in Albany, New York)

By Daniel Wiessner