Crowdsource crimefighting. $10k bounty per thief or drug dealer brought to police. $100k per violent criminal, dead or alive. Bounty is doubled for repeat offenders.
Advertise the bounty program in rural America. Trucks full of armed rednecks will arrive within a week and the criminal underclass will scurry like rats.
Funding comes from the city's billion-dollar-plus homeless benefits programs.