Arbitration award vacated due to "evident partiality" of the arbitrator

Bear with me as I catch up on decisions announced over the last week, as I was in trial.

The Twelfth District in City of Mason v. Mason Professional Firefighters IAFF Local 4049 has vacated an arbitration award in favor of the union due to the "evident partiality" of the arbitrator, based on the arbitrator's role as executive director of a union-advocacy group.