Feds raided the home of secretive upstate cult Nxivm’s female co-founder Tuesday — a day after its leader was arrested in Mexico on charges of sex trafficking and forced labor.

FBI agents spent hours scouring the Halfmoon home of Nancy Salzman, a nurse who in 1998 created the self-help group with Keith Raniere, the Albany Times Union reports.

Prosecutors say Raniere, known as “Vanguard,” led an even more secret society within Nxivm where women were blackmailed into becoming his sex slaves, and were permanently branded with his initials. He’s scheduled to be arraigned in Texas on Tuesday afternoon.

Salzman, known in the group as “Prefect,” was also involved in a non-profit called the Ethical Science Foundation, which is now being probed by the state attorney general for doing brain-activity studies with no oversight, according to the Times Union.

The foundation was formed by Clare Bronfman, an heir to the Seagram’s whisky fortune and a senior Nxivm adherent, the paper reports.

A Vancouver woman filed a complaint in August saying she was recruited by Salzman to take part in one of the experiments in 2016, where she was hooked up to a brain activity monitor and shown disturbing footage of murder and rape.