During Saddam Hussein’s dictatorship, many Iraqi Shi’ites fled to Iran, where the Iranian government organized them into political parties and militias.
When the US overthrew Saddam in 2003, these Iran-backed parties and militias returned to Iraq, where they rapidly asserted themselves in Iraq’s politics, economy, and security.
They fought the nascent Iraqi government; they fought US forces; they fought the Kurds and Sunni Arabs; and they fought each other. But, in 2014, they mobilized to fight off ISIS after the Iraq army basically collapsed and were reorganized as the Hashd al-Shabi or Popular Mobilization Forces (PMF).



