Anwar al-Awlaki
an American-born radical cleric killed in a 2011 drone strike in Yemen. He was the first U.S. citizen to be intentionally targeted by such a strike. A senior al-Qaeda operative, Awlaki was involved in recruitment for the organization and had ties to the September 11, 2001, hijackers as well as other terrorists. His death raised questions about due process (he was never indicted) and whether the U.S. government can lawfully target its own citizens with lethal force.