Field guide to agent provocateurs
Montebello 2007 Riot Prevented - Identical Boots Exposed Undercover Police Provocateurs
At the ‘Security and Prosperity Partnership’ meeting protests at Montebello Quebec on August 20, 2007, a Quebec union leader caught and outed three masked undercover Quebec Provincial Police operatives dressed as ‘black bloc’ protestors about to start a riot by throwing rocks at the security police. See the following videos documenting this event.
Stop SPP Protest - Union Leader stops provocateurs
Evidence -- Police provoke Violence at SPP protest
The operation was exposed by the following picture of the undercover police wearing combat boots identical to those of the security police arresting them.
(Provocateurs in Montebello wear the same shoes as the Quebec policemen who arrest them!)
Lots more great stuff at the link.
And a reminder that the first person to call for violence is the informer.