SMALLVILLE actress Allison Mack was secretly second-in-command at Keith Raniere's rape cult, its former publicist has claimed.

The "brutal" actress, 35, was allegedly in charge of recruiting new women into NXIVM, claims Frank Parlato - who says he worked with her and Raniere.

6 Smallville star Allison Mack has been accused of being the second-in-command of the sinister sex cult NIXVM Credit: Getty - Contributor

Writing in a blog post on his personal website, he claimed that Mack even started branding her intitials on other women.

He wrote: "Mack, the second in command of DOS – which stands for Dominus Obsequious Sororium (translating to 'the slave women under the master') – reportedly has Raniere’s initials branded on her pubic region.

"And she has her own initials, along with Raniere’s, branded on dozens of other women.

"She used her celebrity status to persuade women into sending Raniere graphic nude pictures and confessions to use as blackmail and used her own home to have them branded with a hot iron by physician Dr Danielle Roberts, one of the slave women of Mack and Raniere.

6 It was even claimed the star branded her initials into 'dozens of women' along with cult leader Keith Raniere Credit: FRANK REPORT

6 Last month the 'brainwashed' actress was seen in a video of the moments after Raniere was arrested for sex trafficking

"Allison Mack may be mentally ill. She may be a victim. She may be a brutal creature.

"Either way Raniere preyed on her and brought the worst out of her.

"Whether she remains loyal to him or turns and gives evidence against him remains to be seen.

"In any event, Allison Mack as she exists today is a human tragedy."

Sun Online has led the way in uncovering claims about the group and its supposed members, including:

​Leader of a controversial group​ ​Keith Raniere​ ​which allegedly branded and blackmailed its followers has been arrested on sex trafficking charges

6 Frank Parlato - who claims to have worked with Mack, right, and Raniere - said the actress 'may be mentally ill' Credit: Instagram

"Brainwashed" actress Mack was seen in video leaked to Sun Online showing the moment after Raniere was arrested on suspicion of sex trafficking.

She is heard asking "what's going on?" as cops hold Rainere inside a police car.

Other women - believed to be fellow actress Nicki Clyne and high profile followers Lauren Salzman and Loreta Garza - can be heard saying frantically: “We’re going to follow them… let’s go you guys.”

Sources told Art Voice that Mack could now face sex trafficking charges.

6 Mack starred as Chloe Sullivan in Smallville, a series about Superman's early years

6 NIXVM leader Keith Rainere was arrested for sex trafficking in Mexico late last month Credit: ARTVOICE/ FRANK PARLATO

Nxivm group leader Keith Raniere teaches nannies how to hold babies

Arrest documents state that Raniere was living with “several women” when he was arrested over allegations of sex trafficking at a luxury villa near Puerto Vallarta, Mexico.

These women chased after Raniere in their own car "at high speed" as he was driven away by cops, police add.

Raniere is currently in federal custody charged with sex trafficking and conspiracy to commit forced labour.

If convicted he faces life in prison.

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Known as "Vanguard" to followers, Raniere is accused of having a "decades-long history of abusing women and girls".

This includes "repeated sexual encounters with multiple teenage girls" as young as 12, according to the document.

In a federal complaint against the 57-year-old, the US government accuses Raniere of of running a secret society in which women were recruited as slaves from a so-called self improvement group called Nxivm.

Allison Mack has not responded to Sun Online for comment.

Nxivm group leader Keith Raniere teaches nannies how to hold babies

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