FILE - In this June 30, 2002 file photo, members of the Culinary Union Local 226 picket outside the Plaza hotel-casino in Las Vegas hours before their contract was to expire. Fifty-thousand unionized Las Vegas casino workers whose contracts will expire at the end of the month are set to vote on whether to go on strike. The Culinary Union on Wednesday, May 9, 2018, said it will hold a strike vote May 22 at a university arena. (AP Photo/Lori Cain, File)