There is a fun website called The Haunted Museum with, and here is a fun article from said website about exposing fake spiritualists back at the turn of the century when Spiritism was all the rage.
“Is Spiritualism a fraud? Are the spirit-rappings and the spirit-forms of the séance, the prophecies of the palmist and the clairvoyant, the visions of the trance mediums, genuine evidence of a spirit-world, or are they mere catchpenny tricks, engineered by charlatans to charm money from the pockets of the credulous?”
These were questions asked by Pearson’s Magazine in March 1910, when it began a series of articles written by William S. Marriott about Spiritualism. The editors added that “in order that readers of Pearson’s Magazine may judge for themselves the pros and cons of this tremendously important subject. If Spiritualism is genuine, it ought to be a vital factor in the lives of us all: if false, then it and its high priests should be ruthlessly exposed and believers in it disillusioned of a faith that is altogether vain.”