New York Times collection of videos regarding policing and race
The New York Times has put together a great page revisiting some of the videos in the last year and a half that have put racial issues into discussion. From Tamir Rice the 12 year old boy that got shot for having a toy gun, to the recent South Carolina incident where a police officer choked and threw an unarmed teenager for not leaving her seat in class.
http://www.nytimes.com/interactive/2015/07/30/us/police-videos-race.html
And these instances are only the ones that were filmed and became popular. What do you think causes this phenomenon, police officers shooting and attacking black people, and particularly unarmed black people, at such a high rate?