"Congress created OSHA [Occupational Safety and Health Administration] to assure safe and healthful conditions for working men and women by setting and enforcing standards and providing training, outreach, education and compliance assistance. Under the OSH law, employers are responsible for providing a safe and healthful workplace for their workers. […] OSHA's safety and health standards, including those for asbestos, fall protection, cotton dust, trenching, machine guarding, benzene, lead and bloodborne pathogens have prevented countless work-related injuries, illnesses and deaths. Nevertheless, far too many preventable injuries and fatalities continue to occur. Significant hazards and unsafe conditions still exist in U.S. workplaces; each year more than 3.3 million working men and women suffer a serious job-related injury or illness. Millions more are exposed to toxic chemicals that may cause illnesses years from now."
Occupational Safety and Health Administration: http://www.osha.gov/