Rebel Minis sells Red Ops Five. It's basically the early apartment raid scene from Dawn Of The Dead. So the SWAT team has to clear to building of Zombies and rescue survivors. It's based on THW's Chain Reaction System.
That being said, there's no reason why the Zombies couldn't be changed to Gangers or other criminals, their appearance is random and the game can be played solo or cooperatively.
Of course, there's also the normal Chain Reaction rules by THW that are free.
Wargames Foundry sell a ruleset in their Street Violence range, but I've got no experience or info about that one.