Mr. Green also found that Amazon did not produce all of the documents asked for in a subpoena. He said Amazon must post notices inside the warehouse affirming the right for workers to form a union and publicly acknowledging the remedies it must take.

“This is a very stern rebuke of Amazon’s unlawful, retaliatory termination of Gerald,” said Frank Kearl, a lawyer with Make the Road New York, a progressive advocacy group that represented Mr. Bryson.