Editor's note: Readers may be interested in two related stories: "Invested in Terrorism" and "BBC: U.S. Damned if it does and damned if it doesn't". -ALJ Douglas Farah uncovered the story of al-Qaeda's involvement in West Africa's diamond smuggling while reporting on Africa for the Washington Post, which he described in Blood from Stones: The Secret Financial Network of Terror (New York: Broadway, 2004). Mr. Farah, now a consultant, freelance writer on terror finance and national security matters, and a senior fellow at the Consortium for the Study of Intelligence, addressed the Middle East Forum in New York City on...