Federal agents arrested and charged four more people on Tuesday for their roles in the alleged sex cult NXIVM, according to the Albany Times Union.

In addition to the high-profile indictments of NXIVM’s founder Keith Raniere and former "Smallville" actress Allison Mack (pictured above) in April, charges have now been brought against the group’s co-founder Nancy Salzman, her daughter Lauren, and Kathy Russell, the group's longtime bookkeeper, the Times Union reported.

NXIVM’s operations director, Clare Bronfman, was arrested and charged on Tuesday as well. Bronfman is also the heir to part of the Seagram’s liquor empire.

The charges were part of a superseding indictment that was unsealed on Tuesday and obtained by the Times Union.

The indictment charges the six arrested with extortion, forced labor, sex trafficking, wire fraud, obstruction of justice, identity theft and harboring of aliens for financial gain.

It also alleges the parties used "harassment, coercion and abusive litigation to intimidate and attack perceived enemies and critics of Raniere," the Times Union reported.

NXIVM is described in the indictment as a “pyramid-structured organization” and the unsealing of the indictment is a massive development in the case against Raniere’s organization.

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Related:

Liquor heiress charged with aiding group called a ‘sex cult’ [seattletimes.com]

Federal agents arrest NXIVM co-founder Nancy Salzman [abcnews.go.com]