Unions representing Las Vegas casino workers could call a citywide strike as early as June 1 if they do not reach a deal with employers. Las Vegas casino strikes have been avoided in most cases. The last citywide strike was in 1984. It affected 32 resorts and lasted 67 days. A month-long strike in June could cost MGM Resorts and Caesars as much as $300 million in cash flow, according to a union report In 1984, a union strike fund helped support workers during the period they picketed.