TEHRAN — When the protests broke out here last month, Mehdi Moradani answered the call to crush them. On the first day of the unrest, the 24-year-old volunteer member of Iran’s paramilitary Basij force mounted his motorcycle and chased reformist protesters through the streets, shouting out the names of Shiite saints as he revved his engine. On the fourth day, he picked up a thick wooden stick issued by his Basij neighborhood task force and beat demonstrators who refused to disperse. By the eighth day, demonstrators alleging that President Mahmoud Ahmadinejad had rigged his re-election were out by the hundreds of thousands. Mr. Moradani says he mobilized in a 12-man motorcycle crew, scouting out restive neighborhoods across Tehran. He battled protesters with a baton and tear gas. The demonstrators fought back with rocks, bricks and bottles. Mr. Moradani says he handcuffed scores of demonstrators and dragged them away as they kicked and screamed. “It wasn’t about elections anymore,” says Mr. Moradani, a short, skinny man with pitch-black hair and a beard. “I was defending my country and our revolution and Islam. Everything was at risk.” >>>