When U.S. police departments didn't evolve out of slave patrols, they tended to form out of a desire to protect the property of the wealthy. In practice, this meant beating, murdering and arresting people who didn't want to work 12 hour days until they died.

FOOTNOTES:

1. Krypteia: A Form of Ancient Guerrilla Warfare 
2. The Police Journal: Theory, Practice and Principles
3. The Beginning of American Policing
4. How Stereotypes of the Irish Evolved From ‘Criminals’ to Cops
5. REMEMBERING THE 1906 STRIKE FOR UNION IN WINDBER, PENNSYLVANIA
6. State Police were warned about possible racial bias in car searches. The agency's answer? End the research.
7. The Pinkertons Still Never Sleep