We had a number of people injured in SF by mobs of anarchists, and now it's happened in Chicago. People were bashed with hammers and metal batons, and a number had to be hospitalized.
http://www.suntimes.com/12640681-761/suspects-wielding-hammers-and-batons-attack-diners-at-tinley-park-restaurant.html
http://www.suntimes.com/12640681-761/suspects-wielding-hammers-and-batons-attack-diners-at-tinley-park-restaurant.html