Where do prison-based STGs predominantly base their operations?

Prison-based Security Threat Groups (STGs) primarily operate within the prison system because they are formed by inmates and are organized around shared identities or interests, such as gang affiliations, ideologies, or criminal enterprises that thrive in the prison environment. The prison setting provides them with a confined space where they can strengthen their organization, maintain control, and interact with members. These groups are often involved in various illicit activities, including drug trafficking, extortion, and violence, which are facilitated by the unique social dynamics of incarceration.

Furthermore, the structure and hierarchy of prison life foster the development of STGs, where inmates create alliances and establish power dynamics to navigate their circumstances. The limited oversight and the closed environment of prisons allow these groups to operate more effectively, making prison facilities a central hub for their activities. As such, the correct response highlights the significant role that the prison system plays in the formation and operation of these groups.