Raniere, 57, who lived outside Albany, received financing for his twisted operation from Clare Bronfman, an heir to the Seagram's liquor fortune, according to authorities. He was jailed pending an April 27 bail hearing.
Mack was expected to appear in a Brooklyn court later today.
Founded by Raniere in 1998, NXIVM offers "programs that provide the philosophical and practical foundation necessary to acquire and build the skills for success, it's website reads.
Around 160,000 joined the group led by Raniere, who is known within its circles as "Vanguard", including Mack, Battlestar Gallactica star Nicki Clyne and Dynasty star Catherine Oxenberg's daughter, India.
Mack was reportedly introduced to the self-help group around 2006 by her Smallville co-star Kristin Kreuk.
Kreuk, who portrayed the young Superman's love interest, Lana Lang, signed up, but got out before female acolytes began getting forcibly branded.
Mack played Clark Kent's starry-eyed blond pursuer, Chloe Sullivan.
Kruik put out a statement after Raniere's arrest saying she left the group five years ago, did not experience any nefarious activities and has denounced his alleged abuse of women.
