superagency

noun2

1. •
   An agency with unusually far-reaching powers

   • […] a plan to create a Brussels superagency that could intervene in domestic markets lacks natural consumer appeal and faces formidable industry opposition. — 2007
2. •
   A cabinet-level agency within the executive branch, composed of several departments.

   • The state health agency in California is called State Department of Health Services and is a component of a superagency, the California Health and Welfare Agency. — 2001