sentences:  Zinn believed that U.S. President George W. Bush and followers of Abu Musab al-Zarqawi, the former leader of al-Qaeda in Iraq, who was personally responsible for beheadings and numerous attacks designed to cause civil war in Iraq, should be considered moral equivalents.Jean-Christophe Agnew, Professor of History and American Studies at Yale University, told the "Yale Daily News" in May 2007 that Zinn's historical work is "highly influential and widely used.