Bangladesh protesters fight 'anti-Islam' label

Dhaka, Bangladesh (CNN) -- Every day since early February, hundreds of thousands of demonstrators have massed at an intersection in Bangladesh's bustling capital city. But unlike the Tahrir Square and Occupy Wall Street movements, they're not calling for the overthrow of the government or greater economic equality.

The rallies, led by youths and fueled by social media, are demanding the death penalty for those who took part in war crimes during Bangladesh's bloody battle for independence from Pakistan more than four decades ago.

And in the fourth most populous Muslim country in the world, the peaceful movement is also trying to achieve something remarkable: a ban on extreme fundamentalist parties.

"It's a revolution. A social revolution," says Dhaka resident Shaon Tanvir. "They have been using social media very effectively. A couple of hours' notice, and hundreds and thousands of people turn up."