Nusra Front abducts US-backed rebel leader, blunts efforts against ISISThe Nusra Front, which Washington has designated a terrorist organization, has a track record of crushing US-backed rebels in Syria.Members of al-Qaida's Nusra Front [File](photo credit: REUTERS)
![Members of al-Qaida's Nusra Front [File]](https://images.jpost.com/image/upload/f_auto,fl_lossy/q_auto/c_fill,g_faces:center,h_720,w_1280/273554 "Members of al-Qaida's Nusra Front [File]")