How do the gang bases work?

[WhoisDan]

Not entirely sure how the whole gang base thing works. How does a gang get a base? Where are the bases? Are all gang bases situated in red zone?

 

[Tapeworm]

Gang bases are based in the red zone only, they also have all the shops and work like a spawn point.

 

[WhoisDan]

Gang bases are based in the red zone only, they also have all the shops and work like a spawn point.

And how do you get a gang base?