The Culinary Workers Union announced the tentative 5-year agreement Thursday 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.