Final answer:
The role of OSHA in providing oversight for this issue is to promote safety by investigating the incidents.
Step-by-step explanation:
The role of the Occupational Safety and Health Administration (OSHA) in providing oversight for the issue of toxic chemicals being incorrectly labeled that led to severe injuries of two lab employees is to promote safety by investigating the incidents. OSHA is responsible for enforcing workplace health and safety regulations, which include limits on hazardous chemical exposure and requirements for employee access to hazard information.