Giving to charity is incumbent upon every Muslim. Throughout history, Muslims have donated to the poor and to charitable endowments set up for the purposes of promoting Islam through the construction of mosques, schools, and hospitals. In recent years, there has been a dramatic proliferation of Islamic charities, many of which were created in the declining decades of the 20th century by the infusion of oil money into the Muslim world. While most of these are legitimate, there is now considerable and worrying evidence to show that others have more questionable intentions, and that funds from such organizations have been diverted to support terrorist groups, such as al-Qaeda. The authors of this book examine the contention through a detailed investigation of the charities involved, their financial intermediaries, and the terrorist organizations themselves. What they discover is that money from these charities has funded conflicts across the world, from the early days in Afghanistan when the mujahideen (Muslim Warriors) fought the Soviets, to subsequent terrorist activities in Central Asia, Southeast Asia, Africa, Palestine, and, most recently, in Europe and the United States. This ground-breaking book is the first to piece together, from a vast array of sources, the secret and complex financial systems that support terror.