A Hawke's Bay Mongrel Mob leader who kidnapped and sexually violated a teenager because she failed to pay a drug debt has been jailed for a decade.

Alexander 'Sandy' Tamati, 60, was sentenced by Judge Tony Adeane in Napier District Court on Friday.

Crown prosecutor Steve Manning said it was serious offending that subjected the victim to degradation and dehumanisation. He noted Tamati had a long list of prior convictions.

STUFF Tamati was sentenced at Napier District Court on Friday.

Manning said it was only after the trial that Tamati accepted his culpability, telling a report writer "Now, well, I did it. I actually don't know why I did it".

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Judge Adeane said Tamati, "a Mongrel Mob kingpin", was responsible for "gangsterism" of the worst kind.

He said Tamati's criminal history over 40 years reflected his life time history of gang culture and "so called presidency of the Napier Mongrel Mob".

He had previous convictions of rape and drug trafficking.

Judge Adeane said Tamati had only recently acknowledged his guilt in the offending and had made a "limited expression of remorse".

He sentenced Tamati to 10 years imprisonment with a minimum non parole period of five years. He was also given a first strike under the three strikes legislation.

Tamati had pleaded guilty to a charge of supplying methamphetamine to the woman at the start of his trial last year, but defended four charges of unlawful sexual connection, two of kidnap, aggravated assault, assault on a female, assault with a blunt instrument and threatening to kill or do grievous bodily harm.

A jury took just one and a half hours to return guilty verdicts on all charges against Tamati.

The offending involved a 19-year-old woman who had purchased about $800 worth of the drug from Tamati and was unable to pay him.

Tamati enlisted the services of Mongrel Mob members Hagen Henare and Neil Benson in the early hours of November 26, 2016. They drove to the victim's house, woke her up and made her get in a car. When they handed her to Tamati one of them said "parcel delivered".

While held against her will in the sitting room of the house Tamati assaulted and sexually violated her.

​The woman described to the court a series of incidents in which Tamati assaulted her, threatened her, and sexually violated her. Benson and Henare waited outside the room. At one point Tamati fell asleep and the woman tried to leave, but the other two would not let her.

She was eventually allowed to leave after promising she would return later that night. She went to her mother, who took her to police to report the alleged offending.

Tamati was also known as 'Waldo' and 'Cap', short for captain. He was a senior member of the Mongrel Mob and a former president of the gang's Aotearoa chapter.

Henare, 28, and Benson, 28, were charged with a raft of charges in relation to the offending which occurred in late 2016. They each pleaded guilty to two charges of kidnap and were jailed for two years and six months and two years and three months respectively.