When an employee is injured while he/she is working, they are entitled to workers' compensation. This system provides care and benefits to those hurt on the job. Since it was put into effect in the early 20th century, its laws go beyond covering workplace injuries, but also illnesses that come about because of workplace conditions, called occupational diseases. Compensation laws are different from state to state. There are also special laws for federal employees, and for workers in specific industries like railroad employees.