On November 18th I was assaulted by Plain Clothes Officers. We started off our shift at 16th in Mission in Sf by seeing several strange people. I assumed them to be plain clothes officers because I could see vests under their shirts. When they refused to identify themselves I wondered whether indeed these were "on the job" cops. Many cities around the country are known for having rogue units that take the "law" into their own hands, or are involved in organized crime. As I questioned a woman on her involvement she grabbed my camera and ran at me. From all directions came men who neither identified themselves as cops or gave orders. I assumed I was getting attacked, and I was unsure of by who. As I ran into 16th street two cops cars pulled up with lights on, it was at that point that I stopped and let the arriving officers take me down. Within seconds they could see that the move was faulty, and they released me with no charge