From what I understand:
New York’s finest - police
New York’s bravest - FDNY
New York’s strongest - sanitation workers
Are there any others?
New York’s richest - Yankees!
Corrections Officers : “New York’s Boldest”
TLC Enforcement Officers : “New York’s Proudest”
EMS drivers and paramedics : simply “New York’s Best”.
Streetwalkers: “New York’s Sluttiest”