Terrorism in one of the definitions is the use of armed and other violence to achieve a political or other goal. Terrorist organizations carry out radicalization by which they want to achieve goals with the help of humanity and it is achieved by social change, ideological and political goals of the individual person. Radicalization as such means a change in beliefs, feelings, and behaviors in directions that increasingly justify inter group violence and require sacrifice in defense of the group to which they belong. By recruiting members into their organizations, they get the opportunity to achieve their goals. Most people are recruited who will have a great contribution to the organization, that is, people who will unquestioningly fulfill the goals set by the organization. Terrorists mostly use extremism, that is, violent extremism, as one of the methods of action by which they try to create a kind of society based on the ideological principles that guide a particular terrorist organization. When a terrorist organization is removed, most people, then members, go through the process of deradicalization. In the process of deradicalization, a person undergoes rehabilitation, reintegration and resocialization in order to remove violent extremist beliefs and gain other, socially acceptable ideas. Deradicalization is carried out in stages and the process is lengthy and mostly takes place in prisons and probation centers.