New Delhi, Aug. 5 -- When Susana Pacheco accepted a housekeeping job at a casino on the Las Vegas Strip 16 years ago, she believed it was a step toward stability for her and her 2-year-old daughter.

But the single mom found herself exhausted, falling behind on bills and without access to stable health insurance, caught in a cycle of low pay and little support. For years, she said, there was no safety net in sight - until now.

For 25 years, her employer, the Venetian, had resisted organizing efforts as one of the last holdouts on the Strip, locked in a prolonged standoff with the Culinary Workers Union. But a recent change in ownership opened the Venetian's doors to union representation just as the Strip's newest casino, the Fontaineblea...