In A Colder War by Charles Stross, it is stated several times that the Gates are being used by the protagonists to smuggle heroin.
- The Colonel has "diverted their payload capacity to another purpose",
The main character is "the guy with the diplomatic passport and the bulging briefcase full of heroin and end-user certificates."
There is also the scene where the submarine returns:
Gorman slowly dials it into a combination lock on the briefcase, lets it fall open and unthreads the chain from his wrist. Floodlights glisten on polythene bags stuffed with white powder, five kilos of high-grade heroin from the hills of Afghanistan; there's another quarter of a ton packed in boxes in the crew compartment.
It seems quite clear and nondebatable that the protaganists, a branch of US military/goverment/super-spy types, are smuggling heroin though the gates, at truly unbelievable risks. I can't see at all why they would be doing that. I've now read the novella three times and I think I am missing a lot. Perhaps because I did not live through the cold war.