The actress, who was arrested by the Federal Bureau of Investigation in April of a year ago, was brought in on charges of sex trafficking, conspiracy of sex trafficking, and forced labor conspiracy in relation to the organization that she had reportedly been a part of since 2010.
"As alleged in the indictment, Allison Mack recruited women to join what was purported to be a female mentorship group that was, in fact, created and led by Keith Raniere", United States Attorney Richard P. Donoghue said in a statement after Mack's arrest past year.
Actress Allison Mack attends an event on July 29, 2010 in New York City.
According to prosecutors, Mack recruited women into NXIVM, a network of self-help programs based in Albany, N.Y. The recruits were told the group would help with women's empowerment. Mack is scheduled to be sentenced on September 11 this year.
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Last year, Mack, best known for her role as Clark Kent's clever confidant Chloe on CW's "Smallville", was indicted on charges of sex trafficking, sex trafficking conspiracy and forced labor conspiracy, according to a statement released by the Justice Department.
Marzulli and Mack's attorneys did not respond to CNN's questions regarding whether Mack's plea was entered as part of a deal with prosecutors. If convicted of those charges, she would have faced life in prison.
Prosecutors accused Mack of helping Raniere recruit women to a secret sub-society within the group.
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The women in DOS were also allegedly branded in the pubic region during super-secretive ceremonies with a symbol that later appeared to be Raniere's initials.
Mack also explained why she was drawn to NXIVM, founded by Keith Raniere, who is charged with sex trafficking and possessing child pornography.
Raniere has pleaded not guilty.
Raniere, who was arrested in March 2018, faces the same charges plus wire fraud and racketeering.
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Clare Bronfman leaves Brooklyn federal court in NY on July 25, 2018.
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.
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