Radicalization is one of the major social and security challenges of modern societies. With the aim of preventing its number of manifestations and negative sonsequences, the need for preventive action and protection of the most vulnerable social groups have been created, whicht includes adolescents. In addressing this issue, the need to take preventive measures and activities in the local environment is highlighted in order to prevent the development of negative factors that significantly affect the phenomenon of radicalization among adolescents. In the diploma work, I shall try to analyse the activities of the institutions in the local environment, which are carried out with a view to preventive action in the area of youth radicalization. The local environment refers to the area of the Municipality of Velenje, wherby I shall include the Police, Social Work Centre, Youth Centre and one of the primary schools.