We know they do it, along with all sorts of other dirty tricks, but it appears that the cops may actually have been caught this time. It seems they tried to provoke an incident at the protests against the so-called Security and Prosperity Partnership summit in Montebello, and some clever folks caught evidence in snapshots and videos.
Take a look at this piece at the Ottawa IMC site, which takes a good look at the mounting evidence that this mysterious threesome were police agents deployed to instigate violence. Then there is this story on the CBC site, which of course takes a softer tone but which, interestingly, quotes a retired Ottawa cop as conceding that the evidence presented in video and pictures seems to support the assertion of the protesters that these men were cops or in the employ of the cops.
Thanks to red toque for the heads up.