All National and Federal Law Enforcement Agencies

Police and investigative agencies whose jurisdiction is an entire nation or federal government, the top tier in the standard three-level description of policing (local, national or federal, and international) that criminal justice texts use, spanning historic and current national forces and specialized federal bureaus, and the earliest professional and private detective agencies whose jurisdiction was effectively national. Belongs here: any law enforcement body whose authority and reach are national or federal rather than confined to one city, county or region. Does not belong here: police forces whose jurisdiction is a single city, county or province, grouped under Local and Municipal Police and Sheriff's Departments, or bodies whose jurisdiction spans multiple nations, grouped under International and Multinational Bodies.