Abstract
The main objective of this paper is to define the main dimensions of gang, its structure, mutual connections and influence on the contemporary society at national and international level. This paper is based on knowledge about the issues of gang and presents the main differences and characteristics of formalized and non-formalized gang and the main identical and different characters. It comes from a study of current knowledge on the issue of gang and discusses its general forms. In this paper, a discussion of existing studies and typologies of these peculiar social groups, including an explanation is provided. The next section will introduce the particular qualities of the crimes committed by (mostly youth) gangs and explain their possible causes. The main findings of the paper is putting relations between formalized and non-formalized gang and their influence on the present and future society in the social, psychological, economic, ethnic and criminal dimension.