I'm playing around with the idea that like our world, the galaxy isn't so connected with it's law. Extradition treaties may not be Universal, or what is legal in Sector 5 is Illegal in 89. There could be various law groups who may have tried to unify before and failed. Either due to politics or some super powerful being tearing through and wiping most of them out.

Maybe three or four law groups. With Frontier Galaxies using Bounty Hunters for most of their needs, and more techy and connected Galaxies having a Green Lantern/Nova Core thing going on. Just playing around with ideas.