Photos: Reining in protests

Published 6:52 PM ET, Fri September 7, 2012
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1992: Police officers at the 1992 Republican National Convention in Houston arrest a demonstrator from La Resistencia, an organization protesting acts of violence against immigrants and the deportation of illegal immigrants. The demonstrators failed to adhere to rules keeping them inside a 35-acre protest site across from the Astrodome, where convention delegates gathered. AFP/Getty Images
1999: Riot police march past a damaged Starbucks coffee shop during demonstrations against the World Trade Organization Summit in Seattle on November 30, 1999. Thousands of activists aimed to disrupt the WTO. AFP/Getty Images
1999: A demonstrator covers her mouth with a scarf to protect herself from tear gas after street clashes with riot police in downtown Seattle during WTO protests. AFP/Getty Images
2000: Officers carry a protester to a van during the 2000 Republican National Convention in Philadelphia. Demonstrators committed various acts of civil disobedience, bringing traffic in Center City Philadelphia to a crawl. William Thomas Cain/Newsmakers
2004: Demonstrators at the 2004 Republican National Convention in New York stage a die-in at Broadway and 30th Street. UPI Photo/Landov
2004: The Democratic National Convention held in Boston in 2004 included unprecedented security. Police direct demonstrators toward their permitted protest area -- away from the FleetCenter, where the convention was held. Reuters/Landov
2004: Riot police stand ready inside the gates of Boston's FleetCenter, site of the Democratic National Convention, as protesters march past. Reuters/Landov
2012: Protesters march during the Republican National Convention on August 29 in Tampa, Florida. The group remained peaceful and was allowed to make its own route through the city. Getty Images
2012: Law enforcement officers are reflected in a storefront window as they clear a downtown street during a protest during the Republican National Convention at the Tampa Bay Times Forum on August 28. Getty Images
2012: Police officers face off with protesters blocking the road during a march outside the Charlotte (North Carolina) Convention Center on September 4, the first day of the Democratic National Convention. Getty Images
2012: In Charlotte, a police officer faces off with a protester blocking the road. Getty Images