Terrorist organizations draw individuals into a group dynamics in which the scenery, decor and players have already been adjusted, by using friend relationships, relative relationships, nepotism, local associations, social and cultural activities, ethnic roots, and religious values. While doing so, needs which have not been able to be satisfied are misused as propaganda tools. The terrorist arganizations active in Turkey take advantage, not only of social methods, but also psychological methods, in recruiting new members. They use the promise of meeting the target individuals' physiological and psychological needs, using friends, relatives, fellow-countrymen, social and cultural activities, and religious values. Through the organization's ideology, the terrorists change the attitude of the targeted persons, they penetrate into their perception of the world, form a new subconscious, and in these ways the terrorists give them a militant identity and personality. This paper analyses the group dynamics which shape the life of members of terrorist organizations.