Which of the following is NOT cited as an example of a prison-based STG?

The option indicating that the Bloods and Crips are not cited as examples of prison-based Security Threat Groups (STGs) is accurate because these gangs primarily operate outside of the prison system. The Bloods and Crips originated on the streets, particularly in urban areas of Los Angeles, and while their members may be incarcerated, they do not function as organized groups within the prison environment in the same structured manner as the other groups listed.

In contrast, the Mexican Mafia, Aryan Brotherhood, and Nuestra Familia are all well-recognized prison-based STGs. These gangs have developed specifically within the prison system and maintain significant influence and hierarchy inside correctional facilities, which includes intricate networks that operate on various levels of control over inmates and their activities while incarcerated. Their activities often extend beyond prison walls, but their origins and primary organization are rooted in the prison environment, making them classic examples of prison-based STGs.