Six people have been arrested and $1.6 million in assets seized following a year-long investigation into the Hawke's Bay Mongrel Mob.
On Tuesday police carried out 14 searches of Mongrel Mob members and associates finding more than a kilogram of marijunana, seven firearms and more than $100,000 in cash.
As well as the cash, police seized four houses, cars and motorbikes.
Five men and one woman have been arrested and charged with numerous offences including possession of firearms, possession of cannabis for supply and participation in an organised criminal group.
Detective Inspector Mike Foster says taking the assets will target organised crime.
"Organised crime is all about money," he said in a statement on Monday.
"Attacking the profits of organised criminal groups is a key part of our strategy to deter and disrupt their operations."
Police say further arrests and charges are likely.