As usual the police were taking photographs of everyone attending the protest. There's a list of causes, that if you are associated with, they will maintain a database on you. They'll release a bit to people who file a Freedom of Information and Privacy Request. But, most of what they collect, which is mainly innocent people, they won't disclose. They'll then share this with police agencies inside and outside Canada.
This is a picture the police took at an event I was photographing. I recently filed a FOIP (Freedom Of Information and Privacy) Request to find out what information the Calgary Police Service have on me, mainly related to a case of brutality which I shot pictures of, which they destroyed, as part of a coverup in July 2009.
I went back over my shots of the protest, and liked this, just for how the officers look.
note: Initially the face of the self-declared "undercover" cop (2nd from right) was pixilated. But, since then, I have revealed it, as I believe there is a serious threat to public safety from people who say they're police, fail to provide any ID, and who engage in secret/undocumented detentions.
The Calgary Police had a substantial presence. They mainly watched and took lots of pictures. There were a few arrests, but not many, and relations between police and demonstrators remained civil throughout.
As usual, there was a fair bit of police surveilence. This guy was just one of number.