NEW YORK (AP) — Jury selection is set to begin Monday for a trial expected to detail sensational allegations that a cult-like group based in upstate New York recruited sex slaves for its spiritual leader.

Potential jurors have been summoned to federal court in Brooklyn to fill out questionnaires in the sex-trafficking case against Keith Raniere and three co-defendants prosecutors say were part of an inner circle of enablers. They include wealthy heiress Clare Bronfman and TV actress Allison Mack.

Court papers allege the purported self-help group called NXIVM formed a secret society of women who were branded with Raniere’s initials and forced to have sex with him. The four defendants have pleaded not guilty to conspiracy and other charges. Defense attorneys have insisted any relationship between Raniere and the alleged victims, including an unidentified actress and other women expected to testify against him at trial, was consensual.

After an initial screening of a pool of candidates, a jury will be picked in time for opening statements on April 29. Who jurors will see seated at the defense table that day remains an open question in wake of new allegations that Raniere exploited a teenage girl. His co-defendants have since sought separate trials and engaged in plea negotiations.