I read some of the posts on here about police officers attacking homeless men and I had similar experience when I was a teenager.
I was a skater and around the park one time there was a few police officers who asked a homeless man for identity card which according to my friend who was a witness, I arrived later, he had one. They took it and said he doesn't have one.
In my country if you don't have an identity card that can take you to the local police station and search you.
The homeless man started screaming and said that my friend saw how they took his card. My friend said it's true and started pulling one of the police officers and the police officer started yelling at him.
This was happening at the center of the town - people passing all over and nobody cared.
We were just kids and tried to stop them but they took him in the car and went somewhere.
When they were starting my friend took a giant fucking rock and threw it at the car but didn't hit them.