Failed states offer attractive venues for terrorist groups seeking to evade counterterrorism efforts of the United States and its partners in the Global War on Terror (GWOT). State failure entails, among its other features, the disintegration and criminalization of public security forces, the collapse of the state administrative structure responsible for overseeing those forces, and the erosion of infrastructure that supports their effective operation. These circumstances make identification of terrorist groups operating within failed states very difficult, and action against such groups, once identified, problematic. Terrorist groups that are the focus of the current GWOT display the characteristics of a network organization with two very different types of cells: terrorist nodes and terrorist hubs.1 Terrorist nodes are small, closely knit local cells that actually commit terrorist acts in the areas in which they are active. Terrorist hubs provide ideological guidance, financial support, and access to resources enabling node attacks. An examination of three failed states in Sub-Saharan Africa- Liberia, Sierra Leone, and Somalia-reveals the presence of both types of cells and furnishes a context for assessing the threat they pose to the national interests of the United States and its partners. Al Qaeda established terrorist hubs in Liberia and Sierra Leone to exploit the illegal diamond trade, laundering money, and building connections with organized crime and the illegal arms trade. In Somalia, Al Qaeda and Al Ittihad Al Islami established terrorist hubs that supported terrorist operations throughout East Africa. A new organization led by Aden Hashi 'Ayro recruited terrorist nodes that executed a series of attacks on Western nongovernment organization (NGO) employees and journalists within Somalia. Analysis of these groups suggests that while the terrorist nodes in failed states pose little threat to the interests of the United States or its GWOT partners, terrorist hubs operating in the same states may be highly dangerous. The hubs observed in these three failed states were able to operate without attracting the attention or effective sanction of the United States or its allies. They funneled substantial financial resources, as well as sophisticated weaponry, to terrorist vi nodes operating outside the failed states in which the hubs were located. The threat posed by these hubs to U.S. national interests and to the interests of its partners is significant, and is made much more immediate by the growing risk that nuclear Weapons of Mass Destruction (WMD) will fall into terrorist hands. The burgeoning proliferation of nuclear weapons and the poor security of some existing nuclear stockpiles make it more likely that terrorist groups like Al Qaeda will gain access to nuclear weapons. The accelerating Iranian covert nuclear weapons program, estimated to produce a nuclear capability within as little as one year, is especially disturbing in this context.2 A failed state terrorist hub that secures access to a nuclear weapon could very conceivably place that weapon in the hands of a terrorist node in a position to threaten vital American national interests.