A Lawsuit Against a Black Lives Matter Activist Could Have a Chilling Impact on Constitutionally Protected Activity During a 2016 Black Lives Matter protest in Baton Rouge, Louisiana, someone picked up a rock or a piece of concrete and hurled it at police, striking an officer in the head. Although the assailant was never identified, we know it was not BLM leader DeRay Mckesson, who nevertheless faces a lawsuit that blames him for creating the circumstances that led to the officer’s injuries.