Police have arrested 10 men after a four-month investigation centred on the Dunedin Mongrel Mob.
Officers this morning searched 15 properties in Dunedin, Wellington, Ashburton and the West Coast town of Blackball.
They seized about 8kg of cannabis with a street value of up to $98,000, police said.
Ten men were arrested, including five from Dunedin, four from the West Coast and one from west Otago.
The men all face charges of conspiracy to supply cannabis and possession of cannabis for supply.