What's the source for this data? Is "West Street" the name of a gang? If so, it appears that there are many micro-territory gangs that named themselves after s

What's the source for this data? Is "West Street" the name of a gang? If so, it appears that there are many micro-territory gangs that named themselves after streets. If not, what are all these areas that are named after streets for? I would assume that areas tagged with similar names are part of a larger gang, but that's not made clear here either (are all the "Lower Bottoms" areas part of one group, or affiliated sub-groups?).