Most clinical tools make it possible to assess the criminal’s personality based on various psychological and relational factors, but some make it possible to assess the probability of the risk of taking action, based on the subject’s history, that is his past (experience), his present (introspection) and his future (intention). However, this information is essentially accessible through the subject’s language and verbalizations. The purpose of this article is to examine the extent to which the rhetoric produced by radicalized people can predict violent action. The study focuses on 20 subjects who have been convicted of defending terrorism in France, based on their written and audiovisual productions posted online (on the internet and social networks). The detailed analysis of the content of these verbalizations made it possible to highlight predictors of risk, based on the techniques of predictive linguistics and natural language processing tools (NLP). Key Words Psychocriminology, Risk Management, Predictive Linguistics, Terrorism, Violence, Verbalization, NLP.