These got they hood on smash.
All you gotta do is walk past them and instantly they throwing they set up, pulling guns out etc.
Makeshift shrine in their hood as well
I know where that is, that's the alley west of Fudge Lane where Mara hang out. La Mara also hang out in Vespucci Beach on Melanoma Street. Mara is actually cooler than people think though, they bother people looking for trouble but if you slide through like a "regular" dude most of the time they leave you alone even if you walk past them on foot. You can stop in front of them for a few seconds and they just chill and leave you alone. Mara probably got bigger enemies than Families or something.