Frank Parlato, a former spokesman for NXIVM, revealed on his blog that Mack has been running a secret sorority within the cult that brands women (inset, ex members' brands).
The sorority, called DOS, has a master-slave hierarchy where Mack is only second to Raniere in terms of seniority, the blog states.
Allison Mack, 35 (top left), is reportedly second in command of a secret sex cult at the heart of self-help group NXIVM.
Members allegedly include India Oxenberg, the daughter of former Dynasty star Catherine Oxenberg (mother and daughter are pictured together, right).
Six months after he was born, Mc Guire, 54, asked for equal custody and the pair have been locked in a bitter legal battle over the issue ever since.