Nxivm sex-cult “slave master” Allison Mack helped federal prosecutors bolster their case against Keith Raniere by providing them with an audio recording of the leader talking about branding the group’s members, a new report said.

Nxivm sex-cult “slave master” Allison Mack helped federal prosecutors bolster their case against Keith Raniere by providing them with an audio recording of the leader talking about branding the group’s members, a new report said.