Her release was first reported by the Albany Times-Union. Online records maintained by the Federal Bureau of Prisons said Mack, 40, was released Monday from a federal prison in Dublin, California, near San Francisco. Mack, best known for her role as a young Superman’s close friend on “Smallville,” was sentenced to three years behind bars in 2021 after pleading guilty two years earlier to charges that she manipulated women into becoming sex slaves for NXIVM leader Keith Raniere. The television actor Allison Mack, who pleaded guilty for her role in a sex-trafficking case tied to the cult-like group NXIVM, has been released from a California prison, according to a government website.