Policing in the U.S. is racist (and homophobic, and transphobic, and classist, and ableist, and xenophobic, etc...). The institution itself always targets the marginalized of any society regardless of the basis of their marginalization.
Though to be fair there are a number of white supremacists in U.S. policing and it was intentionally set up that way. See the YouTuber SecondThought's video on the topic, or a more overview of why policing is bad on ThoughtSlime's video on the topic.