The U.S. Federal Bureau of Investigation was widely criticized for failing to prevent the terrorist attacks of September 11, 2001, and some U.S. policymakers reacted by proposing a new domestic intelligence service devoted solely to counterterrorism. To inform the debate, the RAND Corporation analyzed domestic intelligence agencies in four other democracies. While differences exist between the United States and the countries studied, the cases provide insights that could guide policymakers if they decide to establish such an agency in the United States.
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