Ehmm, if im correct, junkers are 'itinerant people of unknown origin', right?
Since the revelation of Gallia, people have lesser trust on them due to their similarity with the Gallic Junkers. So i can assume that Sirius Junkers are just Gallic Junkers who settled in Sirius(as spies).
Does it means that Sirius Junkers are differentiated from their Gallic counterpart with this hostility towards Gallic Lawfuls?