Once you start seeing celebrities showing up you know that your cause is validated. See which young and old celebrities were spotted at protests across the country.

Katy Perry

There are peaceful and violent protests. The gallery of photos in this post are of the not so peaceful kind. It was held in Toronto against the G20 summit by black block protestors. This raises the question of which are the most effective? Makes a person wonder.

Struggles of ordinary people to protect their rights and for a tolerant society have always interested American photographer Janine Wiedel. She was born in New York City, and since 1960s she is photographing student riots, struggles of people and other social unrest.