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Ali Hassan al-Majid, better known as "Chemical Ali," was executed by hanging Monday in Iraq. Last week, Saddam Hussein's notorious cousin and henchman received his fourth death sentence for crimes against humanity, handed down for his role in the 1988 poison gas attacks that killed more than 5,000 Kurds during a campaign against a Kurdish uprising. News of the hanging broke shortly after three suicide car bombs struck hotels in downtown Baghdad, although it's unclear whether the attacks and execution were linked.