Beverage servers, room cleaners and other service workers will vote Tuesday on whether to approve a new contract with four Atlantic City casinos.
Local 54 of the Unite-HERE union reached a tentative agreement with Caesars Entertainment last week on a new three-year deal.
Both sides say terms will not be released until after the vote.
The pact would cover Caesars, Bally's, Harrah's and the Showboat.
The casinos had sought steep pay cuts and also wanted workers to contribute for the first time to their health insurance and pension costs.
Results are expected to be tallied around 8 p.m.