Terrorism and radicalism have resulted in instability in various aspects of people's lives. Therefore, a synergistic participation among all elements is required. This study analyzes the viewpoints from various aspects of efforts to prevent terrorism and the spread of radicalism in Indonesia. Handling of
these crimes often creates problems in society, so preventive efforts are needed to prevent terrorism and understand radicalism. Strategies to deal with the threat of terrorism and radicalism can use two strategies, namely: First, counter-radicalization, namely efforts to instill Indonesian values and non-
violent values. The second is deradicalization. The field of deradicalization is aimed at sympathetic, supporter, core and militant groups so as to abandon violent and terror methods in fighting for their mission and moderating radical ideas.