"Day laborers" are people employed on a temporary, day-to-day basis, normally working in construction, light manufacturing, landscaping, and other similar jobs. Day laborers find work either through a temporary day labor agency (or labor hall) or by waiting on a designated street for an employer to arrive and hire workers as needed. Workers often do not know from day to day whether they will get work. Day laborers typically encounter a number of problems in getting paid fairly for their work. Day laborers are regularly denied payment for their work, many are subjected to serious hazards at their job sites, and most endure insults and abuses by employers. They are often hired by individuals who are trying to minimize their costs and have maximum flexibility. Day laborers may deal with two separate "employers," the agent who hires and pays the workers, and the person at the work site directing the work. Day laborers are not represented by unions and lack protections guaranteed to unionized workers in the same occupations. Many day laborers are undocumented and lack work authorization, making them vulnerable to exploitation.