Which department primarily enforces the statutory law known as ERISA?

The Employee Retirement Income Security Act (ERISA) is primarily enforced by the United States Department of Labor. This department is responsible for overseeing the administration of employee benefit plans and ensuring compliance with ERISA provisions. The Department of Labor's Employee Benefits Security Administration (EBSA) plays a critical role in enforcing the regulations set forth in ERISA, which include standards for fiduciary responsibility, disclosure, reporting, and safeguarding the assets of employee benefit plans.

In contrast, the other departments listed have different spheres of responsibility that do not pertain to the enforcement of ERISA. The Department of the Interior focuses on managing and conserving natural resources. The Department of Justice is involved in law enforcement and legal matters related to federal laws, but not specifically focused on employee benefits. The Department of State deals with international relations and diplomacy. Therefore, the enforcement of statutory laws like ERISA falls specifically under the authority of the Department of Labor.