How do you move up in crip ranks?

Plain and simple: gain respect. The OG will decide what it is you need to do to gain that respect. You join the gang by getting beat up to the point of needing a hospital, but you're not allowed to go to a hospital. If you do, the Crips will kill you. After you've joined, you're just a foot soldier whose only job is to obey the commands of the people ranked above you. Your first mission will probably be to beat somebody up, though most of the time you have to kill someboday (usually a rival gang member). After that, it's all grand theft auto, drug dealing, violence, and murder. Enjoy!