With the global threat of violent extremism on the rise, particularly in MENA countries, developing effective countermeasures has become imperative. Our team's research (Adam-Troian & Bélanger, 2023) recently identified a significant link between obsessive-compulsive symptoms and radical intentions across various ideologies. Previous findings also indicate that obsessive-compulsive symptoms are responsive to cognitive-behavioral therapy (CBT) protocols (McKay et al., 2015). Building on these insights, our novel approach evaluates how CBT can mitigate radical attitudes, thereby integrating mental health treatment with anti-radicalization efforts. The project is structured into four phases. Phase 1 involves a literature review on treating obsessive-compulsive symptoms and collaborating with experts to document CBT protocols. These protocols are systematically scored and ranked by the research team based on their reliability, validity, and practical applicability. The top three protocols are selected for Phase 2’s pre-registered experiments, which test CBT's impact on obsessive-compulsive symptoms and radical attitudes in diverse ideological groups. Phase 3 consists of a meta-analysis of the data from Phase 2 to identify the most effective strategy. Phase 4 implements the best strategy identified in Phase 3 in a longitudinal study, examining its long-term effects on radical attitudes. This phase also explores treatment intensity and dose-response relationships. This research program prepares the groundwork for NSF and NIH grant applications, targeting practical solutions against radicalization. It aims to bridge knowledge gaps, contributing to evidence-based policy and intervention strategies for mitigating radicalization. Expected outcomes include publishing in top-tier journals, conference engagement, and offering undergraduates research experience with opportunities for scholarly publication.