Piracy is the oldest international crime. It had been little more than a footnote for international scholars until a few weeks ago. Now there are proposals to set up some kind of international justice mechanisms, possibly in Kenya. There is a pretty thorough discussion of some of the issues in yesterday’s Christian Science Monitor:
In a sense, piracy is of the same genus as war crimes, crimes against humanity and genocide. Yet it is profoundly different too. It is really much more like an 'ordinary crime' that requires internationalisation essentially so that jurisdictional issues can be resolved. Children dress up as pirates for Halloween. They generally don't dress up as génocidaires (although I seem to recall one of the English princes thinking it was a joke to disguise himself as a Nazi).