We were leaving Gregory park per police orders as the carnival had closed an hour early. We were walking toward an exit in a large group of people and the police officers were saying thing such as "get your ass out of here." And my friend replies with "I'm leaving with the quickness." And the officer proceeds to grab him around his throat and slam him to the ground. Nothing unfolded prior to this video being filmed. Please share this video as this is not the first time injustice such as this has been reported at Lincoln Park Police Department.