The 2010 G20 summit in Toronto must have been a walk in the park. One can see the police hand in hand with protesters singing kumbaya. Noted that this event had police officers from all over the country participating. Many conveniently forgot to wear badges and nametags, some conveniently had masks on:
https://www.google.com/search?q=g20+toronto+police+brutality...
And Vancouver, lovely city! Until they lose the Stanley Cup of course:
https://www.google.com/search?q=vancouver+stanley+cup+riots&...