(CNN) --Returning for his 23-year exile in Iran, Shia Muslim leader Ayatollah Mohammad Baqir al-Hakim was greeted by massive crowds Monday in the Iraqi city of Najaf. CNN Correspondent Jane Arraf ...

Since taking political power in 1979, Iran’s Shia clergy has been supporting the Shia Muslims of Iraq, Lebanon and Syria. This spreading influence has caused concern to the Sunni rulers of Arab ...