Joseph Parker (left) and Beraiah Hales were identified as the leaders of a group known as the Roast Busters, after they boasted online of having sex with drunken, underage girls.

Young women sexually attacked by the Roast Busters gang face being re-traumatised by a TV interview with one of the gang members due to air on Monday night, according to a victims' advocate.

Louise Nicholas said on Monday she disagreed with Joseph Lavell Parker, son of Hollywood actor Anthony Ray Parker and one of the group's alleged ring leaders, being given a prominent interview by Newshub to defend himself.

In 2013, it was revealed a group of young men based in Auckland were allegedly gang raping intoxicated underage girls, and boasting about it on social media. After an 18-month investigation, police didn't lay charges due to a lack of evidence.

LAWRENCE SMITH/STUFF The Roast Busters scandal sparked a protest along Auckland's Queen St after it made headlines.

Newshub said that in the interview to be broadcast this week, Parker said: "We did a lot of things wrong but at the same time we also weren't the monsters that everybody thought that we were, and we didn't do all the things that people thought we did."

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Nicholas criticised the decision to air the interview, saying: "They're giving this guy the airtime to say, 'We were a bad bunch of buggers, but hey, we didn't really do anything wrong'.

"Well, sunshine, look back on Facebook. That clearly shows you were targeting young girls.

"For those that felt they had been harmed by these guys, where's their voice? It's just going to re-traumatise and re-victimise them, and I think that's wrong," she said.

Newshub said it would be broadcasting its full interview with Parker on Monday and Tuesday evenings.

Before the case came to national prominence, police had been investigating the group since 2011 after girls as young as 13 had come forward to lay complaints.

The scope of the investigation was later revealed, with police saying that 35 males were assessed as "persons of interest" and 110 girls were canvassed.

Officers said they would not be laying charges as there was not a reasonable chance of getting a conviction.

Detective Inspector Karyn Malthus said the investigation highlighted some significant issues for New Zealand including the prevalence of alcohol in teenagers' lives and the poor understanding among males and females as to what "consent" was in a sexual setting.

WHERE TO GET HELP

Rape Crisis - 0800 88 33 00 (24hr service), click link for information on local helplines

Victim Support - 0800 842 846 (24hr service)

The Harbour, online support and information for people affected by sexual abuse

Women's Refuge (Females only) - crisis line available on 0800 733 843

Male Survivors of Sexual Abuse Trust (Males only), Helplines across NZ, click to find out more.

If you are in danger, or are being subjected to sexual violence, call 111.