This is from the Denver Post collection of photographs.
University of California, Davis Police Lt. John Pike uses pepper spray to move Occupy UC Davis protesters while blocking their exit from the school's quad in Davis, Calif on November 18, 2011. Pike, the riot-clad police officer who pepper sprayed a row of peaceful Occupy Wall Street protesters at a California university last week, is a retired U.S. Marine sergeant twice honored for his police work on campus. (AP Photo/The Enterprise, Wayne Tilcock) #
And then there's this:
Police raise weapons while making an arrest during the Occupy Denver protest in Denver, CO, Saturday, October 29, 2011. Occupy Denver protesters and law enforcement officers faced off on the steps of the state Capitol and Civic Center this afternoon after protesters marched through downtown Denver for the fourth week in a row. Craig F. Walker, The Denver Post #