1940-1945: diamantsmokkel van Congo naar bezet België (via Forminière)

As the OSS pursued the investigation, it found that the diamonds were reaching the Axis powers through Tangier and Cairo. Its agents, posing as illegal buyers in these entrepots, found that industrial diamonds were being sold for $26 a carat, which was thirty times the official price. It became increasingly clear that enormous profits were being made on the millions of carats that were being smuggled into Germany. Tracing their way back through the chain of illegal sellers, an OSS agent code-named Teton reported back from Leopoldville that "the major source of leakage was the Forminiere Mines," which had been under the control of the syndicate ever since they were developed. According to the OSS report, Teton, pretending to be an American official who had come to the Congo to register "all American males of draft age," made highly productive "contact" in Leopoldville and eventually turned up evidence "that a full year's supply of diamonds had reached Germany from Forminiere through Red Cross parcels." The shipment of several million carats of diamonds through the parcels that were regularly sent from the Congo to Nazi-occupied Belgium required considerable organization and support in the intervening areas.

http://edwardjayepstein.com/diamond/chap9.htm