Profiles growing national phenomenon of day laborers based on first national study, which surveyed 2,660 day laborers at 264 hiring sites in 20 states. Detailed information on worker characteristics, type of work and wages, and working conditions finds they are regularly denied payment and endure hazardous working conditions. Vast majority are immigrant and Latino, 28 percent are U.S. citizens and 75 percent are undocumented, and almost two-thirds have children. Policy recommendations include ways to support worker centers, improve enforcement of labor and employment laws, expand workforce development opportunities, and enact realistic immigration reform.