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a_chenFrom the “At a Glance.pdf”, OSHA covers a wide range of works from private sector works (including 50 states and other US jurisdictions), states and local government workers that operate their programs to federal government workers.
But their do have some types of workers that are not eligible for the act protection such as self-employed workers, immediate family members of farm employers and workplace hazards regulated by another federal agency (e.g. Mine Safety and Health Administration). [https://www.osha.gov/Publications/all_about_OSHA.pdf]