6

It will obviously vary by time period, culture and the effectiveness of law enforcement. For historical perspective, the non-fiction book Gangs of New York describes the gang activity around 1900 up to the prohibition era New York in the 1920s. (The 2002 movie of the same name used this book as source material.) The book lists 42 organized gangs and a number ...


3

This is impossible to know for sure, but you can do some estimations So we we are going to treat is like a Fermi problem, and do some broad estimations and hopefully end up in an order of magnitude of the correct answer. Depending on your world, you can change any of these numbers to tweak your answer. For the ease of math, we will start with a city with ...


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