The Smallville actress was reportedly in tears as she apologised in court on Monday.
Mack spoke of her involvement with the controversial, cult-like self-help group Nvixm - where she pleading guilty to racketeering charges.
“I’m very sorry for who I’ve hurt,” multiple outlets reported she said.
Mack, 36, appeared in U.S. District Court for the Eastern District in Brooklyn, New York, where she pleaded guilty to one count of racketeering and one count of racketeering conspiracy, the U.S. Attorney’s Office for the Eastern District confirms to PEOPLE.
Crying as she addressed the court, Mack said, “I have come to the conclusion that I must take full responsibility for my conduct and that’s why I am pleading guilty today,” Vulture reports.
Prosecutors had accused her of recruiting sex slaves for Keith Raniere, who co-founded Nxivm and its subgroup, DOS, described as an all-female secret society of “masters” and “slaves” in which women allegedly were forced to be sexually subservient to Raniere.
“I’m very sorry for the victims of this case,” Mack said, the New York Daily News reported in a Tweet from court.
“I’m very sorry for who I’ve hurt through my misguided adherence to Keith Raniere’s teachings,” she said, according to Vulture.
“Alison Mack’s life is in ruins and I can’t help but feel sadness for her. At the same time, she had to be stopped. What she participated in was dangerous and criminal,” actress Catherine Oxenberg, whose daughter India was also famously involved with Nxivm, said in a statement to PEOPLE.