Seven patched Mongrel Mob members and 15 others have been arrested today after an eight-month police operation targeting the gang's drug activity.
Fourteen of the people were arrested in Marlborough.
Police search properties of Mongrel Mob members in Blenheim, Picton, Nelson, Hokitika, Christchurch, Lower Hutt, Auckland, Havelock North and Palmerston North today.
There young children present at some properties raided this morning and police have made three referrals to Child Youth and Family.
Police had 20 warrants covering six police districts, with the raids involving about 100 police and drugs dogs, police said.
The operation focused primarily on alleged serious drug offending by Mongrel Mob members across Marlborough.
Marlborough Area Commander Inspector Simon Feltham said the operation had resulted in the arrest of all senior gang members in the region.
''It sends a very clear message to their associates that they are not, and never will be, welcome here,'' he said.
A clandestine drug laboratory was located at an Auckland address and cannabis grow-rooms were found at Wakamarina, near Havelock, and Hokitika.
At a Nelson property a large quantity of plastic bags were recovered with Mongrel Mob insignia printed on them. Police said these were commonly used distributing methamphetamine. Quantities of cash, about one kilogram of dried cannabis and 24 plants, more than nine grams of methamphetamine, a firearm, stolen computers and drug utensils were also recovered, police said.
A total of 250 charges have been laid, including possession of class A and C drugs for supply, conspiring to supply or deal methamphetamine, conspiring to supply or deal class C and B drugs, offering to supply methamphetamine, offering to supply class B and C drugs, possession of class B and C drugs, theft, and burglary.
Police said further charges and arrests were likely.
Mr Feltham said a team of police in Blenheim had put in an enormous amount of work gathering evidence about the gang's alleged drug-dealing and that had led others being identified outside the Marlborough area.
- The Marlborough Express