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This note describes a new and unique, open source, relational database called the United States Extremist Crime Database (ECDB). We first explain how the ECDB was created and outline its distinguishing features in terms of inclusion criteria and assessment of ideological commitment. Second, the article discusses issues related to the evaluation of the ECDB, such as reliability and selectivity. Third, descriptive results are provided to illustrate the contributions that the ECDB can make to research on terrorism and criminology.