U.S. Places Militant Syrian Rebel Group on List of Terrorist Organizations
....The notice in the register lists the Al Nusra front as one of the aliases of Al Qaeda in Iraq.
The Al Nusra Front comprises only a small minority of the Syrian rebels, but it includes some of the rebellions most battle-hardened and effective fighters.
Profile: Islamic State in Iraq and the Levant (ISIS)
ISIS was formed in April 2013 and grew out of al-Qaeda in Iraq (AQI). It has since been disavowed by al-Qaeda, but become one of the main jihadist groups fighting government forces in Syria and is making military gains in Iraq.