How to combat Crime?

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Hey guys, I live in a tough crime city (no not Detroit). It use to be worse but they gutted out alot of the gangs, and it started to get gentrified. My girlfriends family lives around the corner from me and have been the target to multiple vandalism, their car got jacked twice and it was the crack house by them. They are middle class educated, and they own the house. They reported the crackhouse and the city stepped in and shut it down. But they just fixed it up and fenced it up . Most of their neighbors are gang members or affiliated. Someone just thrashed their brothers car twice, and then grabbed a pot and smashed their windows with it. My girlfriend called me and its been about a year since the last incident but now this happened and I am tired. So are they, They want to buy a gun legally and install cameras. But I feel like things are deeper than that, the city is in on it. The prostitution rings, the drugs, gangs,etc. I just finished watching Gotham and it reminds me of how my city is. I see police buying prostitutes and talking to drug dealers too. I want to combat it, because besides this the city is beautiful, and has a lot of potential. But I dont know how and where to start. Even our politicians are bought off.