Ah, so this is what you were so keen to steer the conversation to. Alas, despite the name, wage theft is
not considered a criminal act (misdemeanor/felony) in most US states, so enforcement is left to the Department of Labor and the IRS, not police.
Now I'd agree with you that society should be putting more resources into combating this, but I'm still going to ask you to respond to my earlier question: for the hypothetical city with high-crime and low-crime halves, which should the police focus on?