Law Enforcement Agency (LEA) is a generic term used for local and state police, as well as federal agencies (such as the FBI, the BATF, DHS, Europol, Interpol, etc.) A state is an organized political community occupying a definite territory, having an organized government, and possessing internal and external sovereignty. ... The Federal Bureau of Investigation (FBI) is a Federal police force which is the principal investigative arm of the United States Department of Justice (DOJ). ... The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATFE or BATFE) is a law enforcement agency within the United States Department of Justice. ... The United States Department of Homeland Security (DHS) is a Cabinet department of the federal government of the United States that is concerned with protecting the American homeland and the safety of American citizens. ... Europol (the name is a contraction of European Police Office) is the European Unions criminal intelligence agency. ... This article is about the International Criminal Police Organization - Interpol. ...

For complete list, see:

• list of law enforcement agencies
• list of secret police organizations.