Here's some interesting info. on agent provocateurs here:
http://en.wikipedia.org/wiki/Agent_provocateur
" is
a person employed by the police or other entity to act undercover to entice or provoke another person to commit an illegal act. More generally, the term may refer to a person or group that seeks to discredit or harm another by provoking them to commit a wrong or rash action."
"In the United States, the COINTELPRO program of the Federal Bureau of Investigation had FBI agents pose as political radicals to disrupt the activities of political groups in the U.S., such as the Black Panthers, Ku Klux Klan, and the Student Nonviolent Coordinating Committee.
New York City police officers were accused of acting as agents provocateurs during protests against the 2004 Republican National Convention in New York City."
"On August 20, 2007, during meetings of the
Security and Prosperity Partnership of North America in
Montebello, three protesters were accused of being police provocateurs by Dave Coles, president of the Communications, Energy and Paperworkers Union of Canada. The three masked protesters, one of whom was notably armed with a large rock, were asked to leave by protest organizers. After the three protesters breached the police line, they were brought to the ground, handcuffed, and taken away. The evidence that the arrested people were police provocateurs was circumstantial, including the fact that they were wearing boots identical to those worn by police."