Osama Is Dead, But al-Qaeda Isn't

The U.S. special forces raid that killed Osama bin Laden in his hideout in Pakistan is a devastating blow to al Qaeda.  The terrorist organization and the movement it leads now face a potential leadership void and internal divisions.  But the battle is far from over: aggressive U.S. and allied action -- including military, and particularly, intelligence measures -- are necessary to make a bad situation worse for al Qaeda.