If you're surprised by police punching a teenager in the face in Chicago, here's a history lesson...

"Last Friday, during anti-racist protests in Chicago, a police officer was caught on video punching an 18-year-old woman in the face. Miracle Boyd — a member of the activist group GoodKids, MadCity — says the officer knocked out several of her teeth. She also says the police took her phone, which she had been using to film them hitting another woman with batons"