The Islamic State-Khorasan is forging a reputation for ferocious terrorist violence. Its gunmen massacred 137 people at a Moscow concert hall in March. In January, the group's jihadists slaughtered dozens at a memorial service in Iran. In August 2021, ISIS-K was behind the suicide bombing at the Kabul airport that killed 13 U.S. soldiers and 170 Afghan civilians. Who are these guys? Who is their leader? And what does ISIS-K aim to accomplish by committing spectacular acts of terrorism far from its home base in Afghanistan. In this episode, New America vice president and CNN national security analyst Peter Bergen discuss the group's origins, motives, ideas, and goals.