Thousands gathered at Nathan Phillips Square on Saturday to protest Bill C-51, sweeping legislation proposed by the Harper government in the name of fighting terrorism. Protesters wore Guy Fawkes masks, carried signs warning of "Big Brother," and spoke about the potential loss of civil liberties.

The group was well-behaved but also enthusiastic. Rain might have led to lower attendance in general, but those who were there delivered their message with vigour. Green Party Leader Elizabeth May was in attendance, as was NDP MP Andrew Cash, both of whom took turns at the microphone rallying the crowd.

Take a look at all the action and protest signs in this photo gallery.