Tattoo
If you really want to be part of the gang you will first need to get a tattoo to show off your allegiance to the others. This is no joke, most crews will require each one of their members to get a tattoo of their logo or anything else that is relevant to their organization.
It shows that you are willing to go that extra step and never betray your fellow riders. It is a code of honor among them that they each vow to uphold. On top of that, if you ever decide to leave the crew, you will need to get that tattoo removed, it’s just the way it goes.