Final answer:
The DOL can investigate a licensee if they receive a complaint from current workers or their representatives, who have the right to file with OSHA in case they identify serious hazards or standard violations at their workplace without revealing their identity.
Step-by-step explanation:
The Department of Labor (DOL) can investigate a licensee's conduct if it has received a complaint. Specifically, current workers or their representatives have the right to file a complaint with the Occupational Safety and Health Administration (OSHA), which is an agency within the DOL. They can do this if they believe a serious hazard exists or if OSHA standards are not being followed in their workplace. It's important to know that employees have the right to request an OSHA inspection without their employer being informed of the complainant's identity. Moreover, the Occupational Safety and Health Act (OSH Act) protects employees from retaliation such as being fired, demoted, or discriminated against in any way for exercising their right to file a complaint or using other OSHA rights.