Final answer:
The agency created by Congress that manages construction site safety is called the Occupational Safety and Health Administration (OSHA).
Step-by-step explanation:
The agency created by Congress to manage construction site safety is called the Occupational Safety and Health Administration (OSHA). Established under the Occupational Safety and Health Act signed into law on December 29, 1970, OSHA's mission is to ensure safe and healthful working conditions by setting and enforcing standards in the workplace, along with providing training and assistance. OSHA enforces standards through inspections, and can issue fines for non-compliance. It also enforces various whistleblower statutes, aimed at protecting those who report violations of health and safety regulations.