Zarqawi Movement Vows al-Qaida Allegiance BAGHDAD, Iraq - The most feared militant group in Iraq, the movement of terror mastermind Abu Musab al-Zarqawi, declared its allegiance to Osama bin Laden on Sunday, saying it had resolved a dispute with al-Qaida over strategy and vowing unity against "the enemies of Islam."   The question of al-Zarqawi's relationship to bin Laden and the al-Qaida leadership has been the subject of considerable speculation. Some experts believed al-Zarqawi - who has claimed to be leading a bloody campaign of bombings against U.S...