Shortly after ISIS leader Abu Bakr al-Baghdadi declared himself leader of the so-called "Islamic State," Muslim scholars published a 17-page open letter to Baghdadi, challenging everything from his claim to be "caliph," or leader of the world’s 1.6 billion Muslims, to the way his group "cherry-picks" verses from the Koran to justify its actions.
The September 2014 letter was translated into 10 languages and signed by more than 120 supporters, from the grand mufti of Egypt to a professor of Islamic studies at Massachusetts’ College of the Holy Cross.