If they are a criminal network, then there has to be a trace of them somewhere. I would think we could start with searching through the database to show some sort of pattern involving imPort related crimes. By starting through a different route we can see if there are known instances of the name being used to promote an agenda and dig for their names.

[ He pauses. This isn't how he wanted this conversation to go but.... it was something. Maybe he can still salvage it. ]

What is your plan, Kitagawa-san?