One has to wonder whether this feral police activity is a recent phenomenon, or has it really been the status quo for a long time. Social media and the internet has taken instant communication and caused it to leap ahead in a quantum fashion.
I had one cop who worked in Chicago for awhile tell me he couldn't take it anymore. Some cops would go joyriding on Saturday nights in the black parts of town, pick up some guy, and just beat the hell out of him in one of the vans, then drop him on the street.
There's been other instances I know of, one involving my brother. I think it was a lot more common than people think. We had cops take the newspapers we were selling, and which we'd paid for, just because they were critical of the chief. Small stuff, I know, but indicative of bigger things.
The time I was detained for murder was because my buddy's father didn't pay off the cops, so they harassed patrons of his bar frequently.