War forced these people to flee from their homes

 When Khomeini rejected Saddam's overture by calling for Islamic revolution in Iraq, Saddam was alarmed.Iran's new Islamic administration was regarded in Baghdad as an irrational, existential threat to the Ba'ath government, especially because the Ba'ath party, having a secular nature, discriminated and posed a threat to the Shia movement in Iraq, whose clerics were Iran's allies within Iraq and whom Khomeini saw as oppressed.