Mashantucket—As the reggae tune “Get Up, Stand Up” blared Sunday, United Auto Workers union flags fluttered in front of passing motorists across the street from the MGM Grand at Foxwoods. On MGM Grand's first full day in business, about 500 yellow-shirted dealers from Foxwoods Resort Casino and other unions used music, placards and flags as rallying calls to broadcast their quest for a Foxwoods union.