Allison Mack, who played Chloe Sullivan for 10 seasons on the Superman TV series Smallville, was arrested Friday in New York on charges of sex trafficking, sex trafficking conspiracy and forced labor conspiracy. She was indicted along with Keith Raniere, the alleged leader of a self-help program and purported pyramid scheme being investigated for operating a shadow society of female “slaves.”

Raniere and Mack each face mandatory minimum sentences of 15 years to life in prison if convicted.

According to prosecutors, Mack is credited in publicly available materials with co-creating a program called The Source, which recruited actors. Read details from DOJ about the case below, but be warned: Some of it is graphic.

“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 today. “The victims were then exploited, both sexually and for their labor, to the defendants’ benefit.”

In 2015, court records show, Raniere created a secret society within his self-help company Nxivm called DOS, “an acronym for a Latin phrase that loosely translates to ‘Lord/Master of the Obedient Female Companions’,” according to the U.S. Attorney’s Office. Investigators believe Mack and other DOS masters recruited slaves by telling them that they were joining a women-only organization that would empower them and “eradicate purported weaknesses that the Nxivm curriculum taught were common in women.”

The U.S. Attorney’s Office for the Eastern District of New York announced the indictment today; Mack is scheduled to be arraigned this afternoon before U.S. Magistrate Judge Cheryl L. Pollak. Raniere previously was arrested on a complaint and ordered detained, the U.S. Attorney’s Office said. He will be arraigned at a later date.

The investigation was led by the FBI, assisted by the New York State Police, the FBI Albany Field Office, the New York State Office of the Attorney General, the New York State Department of Health and the U.S. Attorney’s Office for the Northern District of New York.

Smallville ran on the WB and then the CW from 2001-11 and starred Tom Welling as the young Clark Kent/Superman. Mack, who was a regular on the show for its entire 10-season, later appeared on FX’s Wilfred and had a voice role on the Amazon animated series Lost in Oz.

Here are details of the case from the Justice Department press release: