Columbia subject headings:
Intelligence service--United States.
Internal security--United States.
United States. Department of the Treasury--Security measures.
United States. Secret Service--Security measures.
White House (Washington, D.C.)--Security measures.
Harvard subject headings:
Intelligence service--United States.
Internal security--United States
Presidents--Protection--United States
United States. Department of the Treasury--Security measures.
United States. Secret Service--Security measures.
United States. Secret Service.
White House (Washington, D.C.)--Security measures.
Princeton subject headings:
Presidents--Protection--United States.
United States. Secret Service
White House (Washington, D.C.)--Security measures.