Oh, also, I have a few ideas for this crime syndicate. See if any of these sound good

1: Weird magic cult that's covering their human sacrifices by engaging in more traditional crime. They want to unleash their god: a nasty entity from another realm that will almost certainly commit mass genocide.

2: A group of mad scientists who have come together and said fuck ethics. They want to perform human experimentation freely, thanks. They deal mostly in human trafficking and the organ trade on the black market, but they do some other, more lucrative activities to fund their experiments.

3: They are the mutated followers of a "mutant supremacy" type. They can shape shift into many human forms, making them very difficult to track. Their leader wants to take over the city and turn it into a mutant utopia, but he definitely won't stop there. And it almost certainly will not be a utopia.