A television actress best known for playing a young Superman's close friend was charged with sex trafficking. Allison Mack was accused in an indictment unsealed Friday in federal court in Brooklyn. Mack, 35, starred in The CW network's Smallville," ending in 2015. Prosecutors said she helped recruit women for leader Keith Raniere and his cult-like organization called NXIVM. She told the women they were joining what was purported to be a female mentorship group. But "the victims were then exploited, both sexually and for their labor," according to federal prosecutors. Prosecutors said she required women she recruited to engage in sexual activity with Raniere, who paid Mack in return. Raniere, 57, was arrested last month. The FBI has filed sex trafficking charges against him, saying that with the help of mostly female assistants, he blackmailed and coerced women into unwanted sex. Raniere sold himself as a self-improvement guru. NXIVM promoted Raniere's teachings as a kind of mystical, executive coaching. Women who were part of a NXIVM subgroup [came] forward to say that they had been physically branded with a surgical tool against their will. Prosecutors said in court papers that Raniere created a society within NXIVM called "DOS" - an acronym based on a Latin phrase that loosely translates to "Lord/Master of obedient female companions." Women were required to provide damaging material about their friends and family, naked photos and even sign over their assets as a condition for joining, they said.