Is this considered a tag? No, it's graffiti. Sotel are still around and here's a big example of that. The names are still great. Bones, Slugger, and Pelon. Ironically, a childhood friend was called Pelon, since he always had a shaved head. He wasn't really in Sotel, but had friends who were, and they'd call him that.
When do they do this? Middle of the night? During the day? How old are they? 15, 20, 25? Little by little, there's less and less of them, where do they go? Have they blended into the regular work force? Are they third or fourth generation, or are they newer immigrants? I don't know if I'm curious just to know, or if I should care.