Imad Yassin a Palestinian is the leader of Jund Ash Sham's military wing. He is a dropout of Abu Mohjen's Osbat al-Ansar, which has long been considered a terrorist organization by the United States, due to its connection with Osama bin Laden's al-Qaida network.[1]
He plegded his allegiance to Islamic State of Iraq and the Levant in 2013 and later became emir of Ain al-Hilweh refugee camp as part of Islamic State of Iraq and the Levant[2]
GUP
was invoked but never defined (see the help page).