Countering and preventing terrorism is a primary concern for state and local law enforcement agencies as well as the federal government. Terrorists are those who support or commit ideologically motivated violence to further political, social or religious goals. The goal of NIJ’s work on domestic radicalization and violent extremism is to provide community leaders with evidence-based practices for bolstering resilience and developing communitywide responses that can prevent radicalization and mitigate threats posed by those individuals mobilized to violent extremism.