“We are told that the police are the bringers of justice. They are here to help maintain social order so that no one should be subjected to abuse. The neutral enforcement of the law sets us all free. This understanding of policing, however, is largely mythical. American police function, despite whatever good intentions they have, as a tool for managing deeply entrenched inequalities in a way that systematically produces injustices for the poor, socially marginal, and nonwhite.”