As an item of interest for Merc campaigns, one that can be used as a roadmap for planning out the shady connections of the corporate world and/or the black market, the following video is quite useful.
It covers an investigation by the New York Times into oil smuggling to North Korea and shows how intricate the operations are to avoid complying with UN sanctions against North Korea.
https://www.youtube.com/watch?v=hDTCHdcPYTQ