Smallville actress begins three-year jail term in sex slaves cult case

Allison Mack has begun a jail term (Mark Lennihan/AP)

TV actress Allison Mack, who played a key role in the cult-like group NXIVM, has surrendered to a California prison to serve her sentence in a case against the group’s spiritual leader.

Mack, best known for her role as a young Superman’s close friend on Smallville, was sentenced to three years behind bars in June.