Spiritualists and Mediums. I don't know, what I do know is that there is no scientific proof of their ability to contact "The other side". I have seen stage "magicians" doing the same thing and admitting that it was a trick, but this does not prove that the others are tricksters.
Are they genuine? Any proof? Even if they are fakes does it matter if others get a peace of mind from listening to them? Do they cause harm?

Who knows...We saw Derek Acora last year and he had a message for my nan from her husband who died 45 odd years ago!! To this day she is still quite spooked about it, he got alot of details correct in how he died. Going to see Colin Fry next month so the jury is out until then....