Which type of gang is primarily focused on criminal activities and has a specific structure?

The focus on criminal activities and the presence of a specific structure distinguishes prison gangs or security threat groups from other types of organizations. These types of gangs are formed within the prison system primarily to engage in and enforce criminal behavior. They often have a hierarchical organization with clear leadership and defined roles for their members, allowing them to coordinate activities, engage in illicit operations, and maintain control both within the prison and beyond.

This structure is a key feature, as it helps the gang to efficiently manage its operations, ensure loyalty among members, and maintain a sense of order that is often necessary for survival in the prison environment. These gangs often have very specific codes, symbols, and initiation rituals, reinforcing their identity and solidarity. In contrast, the other options either do not focus primarily on criminal activities or lack the hierarchical structure associated with gangs focused on criminal enterprise.