Psychology is a significant science to study human behavior. It focuses on Understanding and Predicting emotions, events and mental processes. One of the main Branches of Psychology, of course, is conducting crime researches such as genocide. Nowadays, it seems that genocide gets more and more sensitive and it is not simply aggressive action rather it is described as the systematic planned destruction of a particular group, nation, religion or ethnic group. Thus psychological, health and social problems for the survivors. This book is an important key in understanding the way genocide occurs and learning to recognize signs that could lead to genocide are important in making sure that such horrors do not happen again.