The ringleader, a 41-year-old Swede, was convicted of aggravated drug smuggling after he brought 150 kilogrammes of amphetamine into Helsingborg, southern Sweden.
The haul had been taken by truck from Slovakia, and was seized by police in November last year.
Several of the convicted man’s accomplices were also sentenced, including the driver of the vehicle, who was sent to prison for six years, and another two men who were sentenced to six years and three years respectively.
The police were aware of the men’s activity for a long period of time, and performed a sting operation two days after the amphetamine crossed the Swedish border. The sting was part of a large scale operation involving both Europol and Slovakian police.
The drugs have an estimated street value of 30 million kronor ($4.5 million), and were part of what the Stockholm District Court believed to be a far-reaching international drug network.
The convicted ringleader told the court that he was only part of the operation as he had been threatened by other drug dealers, however the court did not believe his claims. The court pointed to telephone calls as evidence that the man was willingly part of the drug ring.