Las Vegas casino operators are facing a moment of truth as their unionized workers vote on whether to go on strike.

The Las Vegas Review-Journal reported that casino operators are bracing for a “work stoppage” scenario after talks concerning the employees’ wages and benefits, which started last February, broke down.

With their contracts expiring on June 1, members of the Culinary Workers Union Local 226 and Bartenders Union Local 165 are trying to cut a favorable deal with their employers. They are reportedly demanding higher wages, protection from layoffs caused by new technology, greater workplace safety measures, and protection for immigrants with temporary status.

Union spokesperson Bethany Khan said workers will cast their votes Tuesday from 10 a.m. to 12 p.m. and from 6 p.m. to 8 p.m. at the Thomas and Mack Center. Results will be known late Tuesday, according to Khan.