Blocking these sites makes it more difficult for extremist groups to coordinate extremist action in the real world  The greatest fear people have about extremist groups is not their rhetoric, but the actions the rhetoric precipitates. Extremists have proven adept at setting up basic websites through which to build communities to organize and coordinate extreme actions. This means in the most limited form the coordinating of extremist demonstrations and rallies, but also violent and terrorist actions. The best example of this is As-Sahab, al-Qaeda’s media arm, which has used an extensive web presence to galvanize supporters and to coordinate terrorist attacks. [1] In using the tools of the mass media extremists have succeeded in bringing supporters to their cause, people who are often geographically diffuse, into a close community capable of action and disruption that harms all citizens. If blocking these websites entirely ISPs would pose a significant barrier to these extremist groups organising. Even more damaging to these networks in the long terms would be the drop in recruitment due to a reduction in their reach. ISPs can significantly hamper these organizations from ever embarking on serious violent actions, and from coalescing in the first place by denying them their most effective springboard. The most important effect is in the prevention of radicalization in the first place. Preventing, or at least hampering access to extremist materials serves to keep impressionable, swayable people from experiences that might turn them to extremism. [2]  [1] Kaplan, E. “Terrorists and the Internet”. Council on Foreign Relations. 8 January 2009.   [2] Silber, M. and Bhatt, A., “Radicalization in the West: The Homegrown Threat” The New York City Police Department, 2007.  p.83