What Is the Al-Muhajiroun Network That Helped Radicalize London Bridge Attacker Khuram Butt?

“What you’re seeing now is a leadership cadre, a lot of whom are now in prison, and a lot of them are dead,” Pantucci says. “The framework is still there. It is an organization that has always been specifically amorphous. [This] is not a coherent, card-carrying organization, so it is quite difficult to nail down who is a member and who is not,” Pantucci adds.