Sample use: "Timmy went to ??? to procure an 8-ball of cocaine and visit his favorite hooker."
Sort of like chinatown is a general name for an ethnic enclave, is there a general word or a phrase for a criminal enclave?
It is best demonstrated in 80s/90s Japanese gangster movies where the Yakuza often replaced rule of law in a part of a city that contained illegal gambling, prostitution, etc. The Yakuza didn't just run the businesses but in fact replaced the police in those areas, had their own enforcers, laws and judges.
I found a few terms like mobtown or narco town but those seem to be referring to entire towns/cities, not just parts of it.
Hood or ghetto don't necessarily mean control by a criminal element.