THE MAIN LINES OF THE DEVELOPMENT OF TERRORIST IDEAS, ORGANIZATIONS, AND METHODS ARE TRACED. AMONG THE MOVEMENTS SURVEYED ARE THE ELEVENTH-CENTURY ASSASSINS, THE JACOBINS, THE NARODNAYA VOLYA, THE IRISH REPUBLICAN ARMY, THE SOCIAL-REVOLUTIONARIES, THE INTERNAL MACEDONIAN REVOLUTIONARY ORGANIZATION, THE STERN GANG, IRGUN ZVAI LEUMI, MAU MAU, THE FLN, (NATIONAL LIBERATION FRONT, ALGERIA), THE TOPAMAROS, THE PROVISIONAL IRA (IRISH REPUBLICAN ARMY), AND CONTEMPORARY PALESTINIAN GROUPS. MODERN THEORIES AND MODELS OF POLITICAL TERRORISM ARE GIVEN CRITICAL ATTENTION THROUGHOUT. THE CONCLUSION SUGGESTS THE ADOPTION OF A COMBINATION OF EFFECTIVE MEASURES BY NATIONAL GOVERNMENTS HARMONIZED WITH A STRONG EUROPEAN COMMUNITY ANTI-TERRORIST POLICY. (AUTHOR ABSTRACT MODIFIED)