Cantor Fitzgerald, the brokerage firm that lost 658 employees in the Sept. 11 attack, has sued Saudi Arabia, charging that the kingdom "provided funding and material support and substantial assistance" to Al Qaeda and Osama bin Laden. The suit, filed in Federal District Court in Manhattan this week, goes further than previous 9/11 damage suits in its accusations against the Saudi government and royal family. It singles out four Saudi officials, saying they organized and controlled a network of financial institutions and charities that aided Al Qaeda for at least seven years before 9/11. Cantor Fitzgerald, whose offices were high...