A sex trafficking case involving a self-help group, a television actress and an heiress may be expanded, the AP reports.

The report says Assistant U.S. Attorney Moira Penza told a Brooklyn judge at a hearing today that more people may be charged in the investigation of Albany, New York-based NXIVM and its founder, Keith Raniere.

“Raniere and five other people are facing sex-trafficking and other charges. They include television actress Allison Mack and Clare Bronfman, heiress to the Seagram’s liquor fortune,” the AP reports. “Authorities say Bronfman and Mack helped Raniere form a secret society of sex slaves who were branded with his initials.”

Mack is best known for her role as Chloe Sullivan on the WB and CW series “Smallville” and for playing Amanda on FX’s “Wilfred.”