Photographer Jocelyn Bain Hogg somehow gained the trust of The Firm, a British gang that came to fame in the 1960s with the exploits of the Kray twins, celebrity psychopaths. This was from a set of photos of them (the later members) at play she took some ten years ago; she has plans to update them soon.
Warning: Some pictures NSFW; also, some, like the one above seem to be inaccessible from the main page. To see them, click on one of the thumbnails at the bottom right, then on the Enlarge tab and hit the Next button a few times.