The vote doesn't guarantee that the 2,000 bartenders, servers, cooks and dishwashers at SoFi will walk off the job, but it gives them the option to do so.
Hundreds of unionized Keck Medicine of USC nurses walked off the job and onto the picket lines amid contract talks.
A five-day strike in California and Hawaii by thousands of unionized Kaiser Permanente registered nurses and other health professionals ended Sunday.
More than 800,000 drivers for ride-hailing companies in California will soon be able to join a union and bargain collectively for better wages and benefits under a measure signed by Gov. Gavin Newsom.
Dozens of nurses hit the picket line early Tuesday morning to denounce recent layoffs at Kaiser Permanente in Northern California.
Air Canada said it suspended plans to restart operations on Sunday after the union representing 10,000 flight attendants said it will defy a return to work order.