The Culinary Workers Union announced the tentative five-year agreement today that it said covers about 25,000 workers at the Aria, Bellagio, Excalibur, Luxor, Mandalay Bay, MGM Grand, New York-New York and Park MGM. LAS VEGAS > The Las Vegas hotel workers union reached a deal with MGM Resorts International, the largest employer on the Las Vegas Strip, on the heels of its breakthrough agreement with Caesars Entertainment, saying the agreement provides significant raises and safety improvements.