During the height of spiritualism in the 1920s, Boston medium Mina "Margery" Crandon became a sensation with her dramatic séances and claims of spiritual contact. But not everyone was convinced. Rose Mackenberg, an investigator who worked alongside Houdini, went undercover to expose fraudulent mediums across the country - including mediums like Mina.

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Sources:

• Hauntings - Series 1: 1. The Enfield Poltergeist - BBC iPlayer 
• Enfield Poltergeist | Skeptical Inquirer 
• Overlooked No More: Rose Mackenberg, Houdini’s Secret ‘Ghost-Buster’ - The New York Times 
• HOUDINI'S GREATEST NEMESIS — American Hauntings 
• Houdini's Greatest Trick: Debunking Medium Mina Crandon 
• “The First Klansman”: Xenophobia, Faith, and Redemption in the Indiana Klan | Invisible Indianapolis 
• Ghosts, apparitions, and poltergeists : an exploration of the supernatural through history
• Article clipped from The Gazette
• The New York Times

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