Gangsters are members of gangs or professional criminal organizations who are known for their involvement in the conduct of acts prohibited by law, especially assassination. For decades, these people have been active in several areas of the world particularly in Europe, Asia, United States and Latin America. Most of these gangsters have become infamous either because of the severity of crimes they committed in the past, the fashion through which they assassinated their victims, or because of the popularity of the people that they killed. Gangsters normally choose to become part of gangs as this provides them with a certain level of organization and support that they cannot get when they operate alone. Here is a list of the top 25 extremely notorious gangsters in history.