Smallville Actor Pleads Guilty To Sex-Trafficking For Cult

Former Smallville actor Allison Mack has wept as she admitted to charges that she manipulated women into becoming sex slaves for a group's spiritual leader.

US TV actor Allison Mack has pleaded guilty to charges that she manipulated women into becoming sex slaves for a cult-like group's spiritual leader.

Mack, 36, wept as she admitted her crimes and apologised to the women who prosecutors say were exploited by Keith Raniere and the purported self-help group called NXIVM, based in upstate New York.

Allison Mack has plead guilty to charges of sex-trafficking for cult. Source: Getty.

"I believed Keith Raniere's intentions were to help people, and I was wrong," she told a judge in federal court in Brooklyn, New York City, as she pleaded guilty to racketeering on Monday.

Mack is best known for her role as a young Superman's close friend on the series Smallville.

"I know I can and will be a better person," Mack said.

Her sentencing was set for September 11.

The plea means Mack will avoid going to trial with Raniere, wealthy heiress Clare Bronfman and another member of Raniere's inner circle, Kathy Russell.

All have pleaded not guilty and denied any wrongdoing.

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Court papers allege NXIVM formed a secret society of women who were branded with Raniere's initials and forced to have sex with him.

Defence lawyers have insisted any relationship between Raniere and the alleged victims, including an unidentified actress and other women expected to give evidence against him at trial, was consensual.

On Monday, Mack said that at Raniere's direction, she obtained compromising information and images of two unidentified women - called "collateral" within the group - that she threatened to make public if they did not perform "so-called acts of love".