BAGHDAD — Over the past three decades, Hadi al-Amiri has gone from being a guerrilla fighting on behalf of Iran against his home country, Iraq; to notorious militia leader accused of running "death squads"; to parliament member in Baghdad, where he has emerged as a key player in the fight against the Islamic State (IS). “The Iraqi people, they love bravery,” Amiri said, by way of explaining his newfound influence. -excerpt- Amiri is the leader of the Badr Organization, a Shiite militia infamous during Iraq's civil war for its brutal tactics, which has now transformed into a political party that...