The NBPA is being investigated by the U.S. Attorney's Office in Manhattan.

Union Executive Director Billy Hunter was notified of the investigation by subpoena for documents on April 25, according to two people with direct knowledge of the situation. The people were granted anonymity because they weren’t authorized to discuss the investigation.

“The NBPA will cooperate fully with the government’s investigation,” the union statement said.

NBPA President Derek Fisher had called for an independent review of its finances and business practices earlier in April.