NPR reports: "They come from places like Vietnam, China, Mexico and Guatemala, lured by promises of better-paying jobs and legal immigration. Instead, they're smuggled into the U.S., forced to work around the clock as bussers, wait staff and cooks, and housed in cramped living quarters. For this, they must pay exorbitant fees that become an insurmountable debt, even as their pay is often withheld, stolen or unfairly docked."