WASHINGTON - One of Saddam Hussein's most feared and hated hatchet men oversees the forces that are defending the southern front in Iraq. Ali Hassan al Majid, a cousin of the Iraqi leader, earned his nickname, "Chemical Ali," by overseeing the fatal gassing of thousands of Iraqi Kurds. He may be behind the suicide attack on a U.S. Army checkpoint that killed five people Saturday and the recent shooting of civilians who were trying to flee Basra. "He has been involved in some of Iraq's worst crimes, including genocide and crimes against humanity," Kenneth Roth, the head of New...