On March 16, 1988, 5,000 residents of Halabja, a Kurdish city in eastern Iraq, were killed and 10,000 injured when Saddam Hussein's army attacked with chemical weapons -- perhaps the largest-scale use of such weapons against a civilian population in modern times. That morning, Iraqi Air Force planes bombed the city with a lethal chemical cocktail of mustard gas and sarin, tabun and VX nerve agents. Two days ago, the man accused of overseeing the attack, Gen. Ali Hasan al-Majid, also known as Chemical Ali, appeared before a judicial tribunal in Baghdad. He is likely to go on trial next...