When authorities and witnesses said one of the protesters took a hat from an officer and punched him in the head, the second officer pulled out a baton, and then a gun, which he pointed at the protesters and panned across the crowd to keep them away from him and his partner. Avery Browne, chief of CHP’s Golden Gate Division, defended the officers’ actions and said the agency has had plainclothes officers at these demonstrations since they began Nov.