29, that union leaders were “back at the negotiation table” with MGM Grand Detroit, and were working with a federal mediator in hopes of reaching a new deal after union members rejected a tentative agreement with the casino. DETROIT – Unionized Detroit casino workers are back at the bargaining table with MGM Grand Detroit for the first time since workers voted down a tentative contract agreement earlier this month, officials confirmed Wednesday.Ī union representative said Wednesday, Nov.