Dozens of accusers who are saying they were victims of sex trafficking and forced labor have filed a mass lawsuit against the leaders of NXIVM, a purported personal development organization whose leader has been convicted of charges including racketeering, sex trafficking and child pornography.

The group, which was characterized by Brooklyn federal prosecutors as a “sex cult,” caught national attention after numerous members, including TV actress Allison Mack and an heiress to the Seagram‘s liquor company, were charged with crimes in connection with the group’s activities.