It's an unprecedented move.
The Greens also aren't happy.
Here's how other parties are reacting to the announcement.
Justice Minister Kiri Allan says work is also underway to address the drivers of crime.
Watch it here.
But he's ruled out banning gang patches.
"There have been examples in the past where truces have broken incredibly quickly, and there are other times when they hold."
It comes after a spate of gang shootings in Auckland.
They say too many of their people are involved and are planning to meet some this Friday.