Stuart Dawson, known as Dink, was convicted of conspiracy to supply class B drugs at Caernarfon Crown Court.
He is the Europe and Asia head of the Outlaws gang and was found guilty after extensive surveillance work in his stronghold of Colwyn Bay.
It was from there that he oversaw the rapid growth of the gang as it challenged bitter rivals the Hells Angels in its heartland.
The feud led to the murder of Hells Angel Gerry Tobin on the M40.
He was shot by Outlaws who were angry that a rival festival had been held in Warwickshire, an area they considered to be their turf.
After the shooting the killers were in contact with the Outlaws hierarchy within minutes.
Outlaws and Hells Angels also clashed at Birmingham Airport, using machetes and iron bars to attack each other in the arrivals hall.


Dink ran the Outlaws from his chapter's clubhouse in Colwyn Bay, but travelled widely overseeing the setting up of new chapters all over the world.
It is thought he spent £200,000 in the last ten years on foreign travel, but his undoing came just a few miles from home.
Detectives noticed a pattern in phone calls between high-ranking Outlaws prior to drugs deals.
On the last occasion, Dink was present. Amphetamines worth £20,000 had been sold.
Last year Dink spoke exclusively to Sky News, denying police assertions that he was the head of one of Europe's biggest organised crime gangs.
Detectives believe Outlaws are involved in drug dealing, murder, prostitution and extortion across the world.
Last July Dink told me: "If any of our members have done anything wrong they've been duly punished for it.
"It's ridiculous to say we're an organised crime group, we're disorganised really, we're just different."
The Outlaws gang was established in 1935 in Chicago.