At anti-war rallies, thousands exercise their freedom of association and expression, but, if you're anti-left or pro-Bush, speech is not so free.

"You should be ashamed, you fascist," protesters jeered at demonstrators who opposed their anti-war message.

A handful of young conservatives founded Protest Warrior (search) last year. With an in-your-face style the group tries to provide a balance at demonstrations promoting a liberal, anti-war agenda.

"We were met with some violence," said Kafir Alfia (search) of Protest Warrior. "A lot of yelling and name calling. 'Nazi' and 'fascist' are very popular."

Leftist event organizers have tried to kick Protest Warrior out of their marches, but police refused, saying protesters can't censor what signs show up at their protest.

After starting out with a handful of people, Protest Warrior is now growing at rate of five to six new members a day, with chapters in 13 cities.

Click on the video box at the top of this story to watch a report by FOX News' William LaJeuness.