Smallville actor Allison Mack has been sentenced to three years in prison for her role in the scandal-ridden, cult-like NXIVM group.

Mack had previously pleaded guilty to charges she manipulated women into becoming sex slaves for the group’s spiritual leader, Keith Raniere.

She co-operated against Raniere and took responsibility for helping him create a secret society of brainwashed women who were branded with his initials, which was expected to lower her sentence.

Mack is best known for her role as a young Superman’s close friend on the series Smallville.