Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.
DC Circuit: Verizon New England Inc. v. NLRB
Labor law
As the arbitrator's order deprived the union of a right that was waiveable under the Act, and there was no palpable error, the Board should have upheld the arbitration ruling. Verizon New England Inc. v. NLRB