They've kidnapped Americans, and George Jr. has identified them as a possible next target. So why hasn't anyone heard of Abu Sayyaf

"The ASG is the smallest and most radical of the Islamic separatist groups operating in the southern Philippines. Some ASG members have studied or worked in the Middle East and developed ties to mjuahidin while fighting and training in Afghanistan. The group split from the Moro National Liberation Front in 1991 under the leadership of Abdurajik Abubakar Janjalani, who was killed in a clash with Philippine police on 18 December 1998. Press reports place his younger brother, Khadafi Janjalani, as the nominal leader of the group, which is composed of several factions."