Nayif was an authoritarian who backed puritanical Wahabi clerics and cracked down on political dissent. He was an ally with the U.S. against Al Qaeda.CAIRO — Crown Prince Nayif ibn Abdulaziz, head of Saudi Arabia's feared Interior Ministry who after a series of attacks inside the kingdom became a close Washington ally against Al Qaeda, died Saturday, months after he was named heir apparent in the world's leading oil power.