In San Francisco around the turn of the century, not the Y2K crossover...the century prior, there was a series of ongoing battles among rival Tongs on the streets of Chinatown. Imagine Gangs of New York, but with a different set of issues and similar violent methods of resolution. To an outside observer the scene may appear chaotic, but where the brutality was abundant so was the code and order. 

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Sources: wikipedia.org, britannica.com, sfexaminer.com ‘Chinatown Tong Wars’ by Paul Drexler 2016