Violence as a sociological and socio-historical phenomenon has been an inevitable feature of social community from its origins till today. In spite of different expectations and predictions, the 20th century can be labeled as a century of all sorts of violence. Its consequences in human casualties, material destruction and degradation of the environment can be hardly known. At the beginning of the 21st century, the world is also faced with an alarmingly growing problem of the use of violence as a means to achieve criminal and other illegitimate objectives. Nowadays also such violence jeopardizes fundamental human freedoms and rights, and general security, as well as state sovereignty, territorial integrity, even survival of some states. In the inventory of the most diversified forms of violence, particularly important clearly are separatism and terrorism as extremely cruel form of organized and politically motivated violence. This has become a prevailing internal security problem in a considerable number of countries worldwide, and also a means of achieving different objectives in international relations.