June 12 (Reuters) - A U.S. appeals court on Wednesday

tossed out a judge's order that required Amazon.com ( AMZN ) 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.