For Mahoma Lopez, a long-time restaurant worker in New York City, it came down to a decision between fight and flight. Last fall, his boss at the cafe on the Upper East Side where Lopez had worked for years began cutting hours and screaming at his employees, withholding overtime pay and threatening to fire anyone who complained. Being Mexican-born and with halting English, Lopez had been in this position before. Time after time, he’d quit; to be a proud man in his industry required a fair number of employment changes.