The region description mentions a local biker gang and that is all I have.
Rockstar names gangs. Every previous game has had named factions with their own colours and territory. If this one has a name somewhere in official material I have missed it, and if it does not, that means the reveal is being held back, which is itself interesting.
Every named faction in previous games arrived with a colour and a territory. If those exist here they have not been shown.
Your point about it being held back is the interesting one. Rockstar names factions when they want you to think about them and stays vague when the reveal is part of the story.
No name in any official material I have seen. Region description mentions the gang and stops there.
So the absence of a name is a signal rather than an oversight. That is a better answer than a name would have been honestly.
bikers next to a sugar refinery in the middle of nowhere. they do not need a name, i already know exactly what those people are like