Justice Edwin Wylie has also forbidden photographs from being displayed in the gallery.
Mongrel Mob members wear red as their gang colour. Yellow is the colour associated with the rival Tribesmen gang.
On trial are eight Mongrel Mob members, Quentin Duane Pukeroa, Kingi Morgan Gemmell, Lynette Victoria Teddy, Massey Ngaheu, Jason Kirk Iopata, Clayton Fox, Terry John Faataape and William Te Paire Aramoana.
Pukeroa has pleaded not guilty to the murder of 16-year-old Jordan Herewini and attempted murder of Iwi Delamere.
He is also charged together with Gemmell and Teddy and unknown others on January 27, 2009, entering 43 Matai St, Murupara, and injuring Jamie Herewini with intent.
Iopata is charged with actively suppressing evidence against Pukeroa and Gemmell to enable them to avoid arrest or conviction by hiding a van containing weapons. He is also charged with possessing a restricted weapon, a stun gun.
Faataape is charged with possessing a shotgun at Murupara on February 2, 2009.
Additionally, he's charged with possessing offensive weapons, a metal pole and bar, at Murupara on February 17, 2009, with the intention of using them to commit bodily injury or the threat of fear or violence.
All the accused, along with unknown people, are charged with participating in a criminal group, the Mongrel Mob, knowing that may have contributed to criminal activity.
Each accused has pleaded not guilty to all the charges they face.
Opening for the Crown, Rotorua crown solicitor Fletcher Pilditch outlined on-going conflict between the Mongrel Mob accused, Tribesmen gang members and other Murupara residents in late January last year.
He said tensions built when the Mongrel Mob was in Murupara, traditionally Tribesmen territory, for a tangi.
Initially police had dissipated general hostility, skirmishes and "verbals" between the two gangs but it reignited on January 27 at a local swimming hole.
Tribesmen member Iwi Delamere had been called a "Barbie Doll" and his car rocked. Further tensions erupted when Mongrel Mob members saw Jordan Herewini wearing a yellow school PE tee shirt, believing it was a display of Tribesman colours. Blows were exchanged and a tomahawk produced. During a struggle Pukeroa was hit on the head.
Three Herewini brothers took one of the Mongrel Mob's vehicles, torched it and pushed it into a quarry.
"Mongrel Mob members began gathering weapons, including poles and bits of wood looking for the truck and revenge," Mr Pildtich said.
The group descended on Iwi Delamere's home. He was out but his partner and small baby were there. The Mongrel Mob members smashed windows and property inside the house.
They moved to a house in the same street, smashing windows. The Herewini brothers were caught up in the confrontation and Jamie Herewini's shoulder dislocated when he was hit.
Mr Pilditch said Pukeroa put his vehicle into reverse, lined it up, and accelerated through a fence at speed.
"As Jordan Herewini attempted to run off he tripped and was struck full-tilt by Pukeroa," Mr Pilditch told the jury.
Attempts to revive him failed and he died en route to Rotorua Hospital.
Meanwhile Pukeroa had driven directly at Iwi Delamere "who jumped aside with only moments and inches to spare".
Gunshots were subsequently heard and Mongrel Mob members were seen pointing weapons toward the ground as the Tribesmen drove past.
The following day members of the Mongrel Mob's Kawerau chapter returned home but remained in siege mode for a number of days, on alert for Tribesmen retaliation and preparing for confrontation.
Mr Pilditch will conclude his opening address tomorrow.
The trial is scheduled to run for at least four weeks.
