The U.S. Attorney's Office for New York's Eastern District confirmed Bronfman had been arrested earlier Tuesday and will face arraignment in Brooklyn federal court in the afternoon.
Three other people — including NXIVM co-founder Nancy Salzman and her daughter, Lauren — were arrested in the Albany area in connection with the NXIVM case on Tuesday, according to Tyler Daniels, a spokesman for the U.S. Attorney's Office.
Bronfman, the Salzmans and Kathy Russell will be arraigned on racketeering conspiracy charges Tuesday afternoon.
Bronfman, who lives in the Albany area, is a longtime bankroller of NXIVM, which was founded by Salzman and Keith Raniere in the late 1990s.
Raniere was charged in March and accused of leading a secret society that promoted a master-slave relationship with its members, some of whom were groomed to have sex with him and branded in their pubic area with a logo bearing his initials.