(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 last year at the request of the National Labor Relations Board failed to explain why such a sweeping mandate was necessary.

The labor board sought the order after Amazon ( AMZN ) in 2020 fired Gerald Bryson, a union organizer at a warehouse in Staten Island, for making profane comments to a coworker during a protest over an alleged lack of safety measures amid the COVID-19 pandemic.

The warehouse, known as JFK8, in 2022 became the first Amazon ( AMZN ) facility to unionize.

U.S. District Judge Diane Gujarati in Brooklyn ruled that Bryson's firing violated his rights under U.S. labor law and barred Amazon ( AMZN ) from terminating other union supporters. But the judge refused to order Amazon ( AMZN ) to reinstate Bryson, saying there was no evidence that his firing deterred other workers from unionizing.

The 2nd Circuit on Wednesday said the requirement that Amazon ( AMZN ) not fire other workers was unnecessary if there was no evidence that Bryson's firing had a broader impact.