The theme of this thesis is "Violent Crime and its Prevention". The violence can be seen everywhere, in the family, in school, at work or in the streets. Every day the media inform the public about violent crime. Is it true that the violence increases in our society or is it only a report interesting for the media? The purpose of this study is the answer this question. The thesis is composed of seven chapters and a number of subchapters. The first and introductory chapter defines basic terminology used in the thesis, for example criminology, criminality, violent crime, aggression and violence. Chapter two deals with the phenomenology of violent crime. The chapter consist of three parts. Part one focuses on the state of violent crime. Part t...