I have no idea and am not sure I really want to find out.
My view is that if we haven't noticed it then its not causing any harm.
Once people find out about these things then as sure as anything they will blame the residents for all manner of problems.
We all live amongst a range of people whether we like it or not, criminals included. The fact that a few are sited together in one place is in my view irrelevant.

I say this but as being as hypocritical and as human as the next person, I don't want one next door to me!