I'm not sure if you've ever heard of the West Memphis Three, it happened in the early 90's, essentially these young teenage boys were wrongfully convicted of killing three children, the documentary itself displayed the bias the police force, and the courts had against people of a lower class (mind you, all of the boys were white).
Another example you could mention is the attack on Kent State from the National Guard on May 4th, 1970, basically the NG came to Kent University and killed four students who were protesting the Vietnam War. I suppose this is a poor example because the National Guard is more military than police.
Many stories have come out from women who have been sexually assaulted during their time in prison, or jail, there as well have been many stories from men who have been attacked and when they chose to report an incident to an officer, nothing ever actually happened.
I hope this helped out!
