The terrorist incidents in November, especially the ones in Paris and the explosion of the Russian passenger aircraft in midair in Egyptian airspace, have reminded us of the transnational scope and devastating impact of extremism and terrorism. The appeal of terror groups is partly ideological, attracting people across territorial boundaries, and partly local, attracting people on the basis of their grievances against local and national governance systems. A combination of these two root causes can be lethal because of modern communication and transportation technology. International cooperation amongst states is essential for coping with these trends. However, the internal dynamics of a society facing terrorism and the nature of the ideological framework of such groups are no less salient in understanding this phenomenon.