Gangs have a level and experience which can be increased by completing gang activities. A higher gang level allows your gang members to access content and reap higher rewards. It will also make you a bigger threat to rival gangs and make you more profitable to take down.
Experience can be earned for your gang in various ways.
Leveling up your gang provides your gang with various bonuses.
If your gang has control of a turf, you will receive money in the turf safe for completing a variety of criminal activities.