The author analysis the growth of global terrorism and activities of terrorist groups in contemporary world. Focusing on the ethnic and religious background of many terrorist groups, global terrorism, author argues, claims to be a powerful partner in new global conflict, gradually growing into national movements which could be supported by large ethnic, religious or racial communities across the world. Terrorist groups took its driving power and encouragement from the ideas and goals of the main group which principally lies in social injustice or economic inequalities of marginalized large social groups. Their links with ethnic, religious or social background pose the greatest potential threat to states with unstable economies, political turmoil, religious-ethnic hatred and with large-scale immigrants.