A traitor come to Aztecas leader and tell him that Groves are preparing attack against them. Once you go there Tenpenny comes and arrest you, after aztecas send someone to help you to escape from prison. Then you will the traitor, tenpenny, and his asslickers pulaski, and Hernandez. After you come back you find that Los Santos Vagos attacked your HQ, you will have to kick their asses.