see:
http://members.tripod.com/~helenduncan/
Unlike all the floating trumpet mediums of yore, Duncan was a much more interesting case. She was arrested by the British government during WW II for some kind of vague psychic kind of espionage, soon recharged under a relictual anti-Witchraft law, related to her materialization of a sailor (complete with his sailor cap with the name of the ship on it) off a ship that had gone down; the sinking was not acknowledged or publicized by the admiralty.
She was charged under a 260 year old witchcraft act and as a result of her case, it was replaced with the Fraudulent Mediums Act. Although by their admission that this sailor existed and his ship had gone down, as his presence indicated, she wasn't exactly a fraudulent medium. It was a real catch-22 for them. It was determined she was not a German spy, and she was
released after serving nine months or other time in jail (gaol)
related to the same offense. I am glad the British government decided not to burn her at the stake or, as prescribed by the law, hang her for er, being a witch..... at the end of WW II.
She was BTW willing to prpduce a materialization in the courtroom but the government nixed that by insisting she would have to testify to which the defense answered she could not testify if she was in a trance which would be required for her to produce the physical materialization. All and all, an interesting read (see above website).
She continued to be hounded by the police and as a result of a police raid after that she died of a heart attack.
The seance she held involving the sailor was attended by a British naval officer who reported it to his superiors, thus alerting the government to what had happened. The parents of the dead sailor (who didnt know he was dead) were at the seance as well.
The government was clearly not happy about her alleged channeling of a deceased sailor off a British naval vessel, the sinking of which they wanted to keep secret. Churchill later apologized to her according to reports I read about the case.
There is still a movement to have her pardoned officially.