The U.S. State Department last year described it as "the most dangerous terrorist organization in existence." Its leader is possibly the world's most wanted man, accused of killing or wounding nearly 1,000 people, most of them innocent people, in attacks around the world over the past 15 years. But last week there were reports that this ferocious dealer of death and destruction, Abu Nidal, 52, head of the Libyan-based Fatah Revolutionary Council, is ill and possibly dying in a hospital in the Libyan capital of Tripoli, his illness variously reported to be cancer and heart disease. Declared a Cairo-based official of...

