Ngaronoa sold drugs from her home in Napier, where she lived with five of her children. She and her boyfriend, Robert Mason Rewita, 41, admitted conspiring to supply methamphetamine.
Singh also admitted supplying methamphetamine and selling cannabis and was sentenced by Justice Ronald Young to eight years and 11 months in jail. Paul got eight years and four months and Barber five years and seven months.
Ngaronoa also admitted selling methamphetamine and was sentenced to seven years and two months. Rewita also admitted supplying methamphetamine and unlawful possession of a firearm and was sentenced to five years.
The Crown withdrew conspiracy allegations against Tracey Margaret Benson, 43, who admitted supplying methamphetamine and supplying cannabis oil to an unknown prison officer in Wellington.
Recalled from parole on a previous sentence for methamphetamine dealing, she was sentenced to a further two years and one month.
The charges arose from Operation Prince which ran from July to December 2010. Police accessed suspects' cellphone communications and, in the last four weeks, bugged Ngaronoa's home.
During the operation Singh delivered at least 493g of methamphetamine and at least 4.5kg of cannabis, according to a police summary.
At one stage Paul was heard to say the operation had turned over $800,000 in a year, of which $40,900 was found by police in a search in Auckland as the operation came to an end.
Corrections said today that it was aware police may have been looking into the matter but no Corrections staff had been charged in relation to the case.
"The department does not tolerate corrupt or illegal behaviour and demands a high standard from all of its employees. We expect all staff to role model positive, law-abiding behaviour,'' it said in a statement.
