Pittsburgh Post Gazette, September 12, 2009 by Rich Lord and Paula Reed Lord
http://www.post-gazette.com/pg/09255/997503-482.stm
Mr. Choper said governments “can stop people from protesting so it disrupts the event.” But demonstrators are “entitled to some place where [they] can effectively communicate … within sight” of the targets of their message. Rules that aim to keep demonstrators from embarrassing their host city or guests have been struck down, he said.