 In 1989 these four gangs combined forces to violently eject the New Zealand-based street gang, the Mongrel Mob which was attempting to establish itself in Perth.Events escalated over a five-day period where Selwyn Wharepapa, one of the leaders of the Perth Mongrel Mob, was injured in the bombing of the Mongrel Mob's metalwork shop with two kilograms of gelignite and the Mongrel Mob retaliated with attempted explosion at a tattoo shop linked with the Gypsy Jokers.The following night police raided three homes, arresting seven people, including Wharepapa in possession of firearms, baseball bats and drugs.