> The first publicly funded, organized police force with officers on duty full-time was created in Boston in 1838.

This is from your Time.com article.

Second, fugitive slave extradition was controversial in northern states and from your Wikipedia article several northern states even passed legislation to protect fugitive slaves.

And why would northern states spend their own tax dollars to fund police forces to capture slaves? It doesn’t make sense. They created police for public safety reasons in cities.

And even if none of that were true it still does not address the genetic fallacy. Just because some police forces started as slave patrols does not imply that all police today are inherently white supremacist.