The Sei Dorianos are an international Italian smuggling operation. In the last decade, the Sei Dorianos suffered considerably after heavy weaponry and narcotics became legal across New Udonia. In order to remain a powerful player on the international smuggling market, their infamous leader, Il Grigio, expanded their operations into human trafficking. Such actions allowed them to monopolize a market which most smuggling organizations refused to participate in, thereby allowing the Sei Dorianos to dominate the smuggling trade across New Udonia.
Although classified as a monopolizing member of the T6, the Sei Dorianos have managed to survive by using legitimate shipping fronts to masquerade their prisoner transports. The Sei Dorianos' "merchandise" has enabled them to gain powerful alliances with other criminal organizations, such as the Galton Foundation.