(in the US) There is no single pre-eminent, all-powerful, law enforcement body or agency in the United States. Therefore, it must be presumed that the question is asking about what federal agencies have nationwide police/law enforcement arrest powers to enforce CRIMINAL law ANYWHERE in the nation.
I will omit attempting to list agencies and their agents who possess power to enforce CIVIL law as it wold apply to virtually EVERY federal agency within the executive branch.
For the nationwide enforcement of CRIMINAL law - such a list might include (but is not limited to): the Federal Bureau of Investigation (FBI) - the US Secret Service - the US Marshall's Service - the US Park Police - Immigration and Customs Enforcement (ICE) - the US Border Patrol - the Bureau of Alcohol Tobacco and Firearms (ATF) - the US Postal Inspection Service - etc. This list is not all-inclusive and not all uniformed federal officers possess the same powers, even within the same agency (e.g.: Some Rangers of the US Forest Service are sworn law enforcement officers, but many are not).
If another contributor can think of other agencies which qualify to be added to this list, their contribtuons are invited.
National Law Enforcement Museum was created in 2013.
offical law enforcement was lacking
National Organization of Black Law Enforcement Executives was created in 1976.
National Organization of Black Women in Law Enforcement was created in 1985.
The phone number of the National Law Enforcement Officers Memorial Fund is: 202-737-3400.
Some of the known law enforcement agencies of the country are the Armed Forces of the Philippines and the National Police.
Your local law enforcement agency.
If it is contained in an 'official' report to law enforcement, yes.
In a large country with many regional differences, it would be unwise to have one national police force responsible for all law enforcement. Local law enforcement is more tailored toward the needs of that particular area.
The address of the National Law Enforcement Officers Memorial Fund is: 400 7Th Street Nw, Suite 300, Washington, DC 20004
Only if ordered by the state governor such as martial law.
the wickersham commission