Red Light district
Named for the red lanterns that identify brothels, this is also a district where morally ambiguous and flat-out illegal services can be obtained: prostitution, gambling, illegal substances, stolen goods, and crooks-for-hire. Most people try very hard to either be noticed, or not to be noticed. The police provide a token patrol force, but they don’t do much. The red-light district is where many of the corrupt, off-duty police can be found.