Helen Duncan was a medium in the UK during World War II who was put in jail for her mediumship, based on the UK's Witchcraft Act. During a seance, she said that a ship had sunk before it was public information. Since then, the family has asked for a
pardon in 2006 but it hasn't been
granted as of 2008. Interesting reading, if you want to learn about the bad old days of mediumship. The BBC article above mentions that people were burned alive in the street, most of which were women. Bad old days indeed. The sad thing is that it could happen again today. If you were to learn some type of government secret through mediumship and then opened your mouth about it, you'd be in big trouble. While burning people alive is mostly out of vogue these days, you would get jail time and/or be killed as a spy or traitor anyway, depending on the country you're in and the prevailing mood. So if you ever get such information, you would be smart to keep it quiet and wait till it's no longer sensitive before revealing it, which could be 100 years...