NIJ seeks proposals for research that will help State, local and tribal criminal justice agencies and their attendant communities to implement programs that prevent or counter all forms of radicalization to violent extremism in the United States. Responses can include explanatory models and hypothesis testing, empirical designs with control groups, thick description, case studies and other scientific contributions to our understanding of domestic radicalization to violent extremism as it occurs in the United States. The proposals should respond to at least one of the following focus areas. • Re-Examining Radicalization to Violent Extremism Originating in the United States. • Disengagement and Deradicalization. • Violent Extremism and Gangs: Analogies and Prevention. • The Role of the Internet and Online Discourse in Radicalization to Violent Extremism. • Evaluations of promising practices to prevent or mitigate radicalization.