What is Hezbollah, a name that translates to Army of God? These militant Shia led by the cleric Hassan Nasrallah are expected to retaliate for Israel's assassination of one of their military commanders in Beirut. Hezbollah, considered a terrorist organization by Western governments, is the strongest military force in Lebanon and holds seats in the country's dysfunctional parliament. It has been at odds with Israel for more than 40 years. But where did they come from? In this episode, the Middle East Institute's Randa Slim, a native of Lebanon who witnessed the Israeli invasion of 1982, explores the group's origins.