Why the most dangerous group in Syria isn't ISIS- CNN

Hardly a day goes by without news of the progress being made in the war on ISIS in Iraq and Syria. In recent months, American-backed forces have secured much of the Syrian-Turkish border, recaptured Ramadi, and stemmed the flow of fighters and supplies to the terror group's capital cities of Raqqa and Mosul.

http://edition.cnn.com/2016/02/26/opinions/syria-isis-al-qaeda-nusra/index.html