Cracked.com, America’s online humor and video site posted a recent article about 7 conspiracies ‘that actually happened’. The list is very informative, is historical and encompasses the following:

1. Fascist dictatorship for the USA - The business plot by wealthy American businessmen to make the USA a dictatorship - these businessmen included the heads of Chase Bank, GM, Goodyear, Standard Oil, the DuPont family and Senator Prescott Bush. Many of the persons who had allegedly backed the Business Plot also maintained financial ties with Nazi Germany up through America’s entry into World War II; one can find articles at bbc.co.uk online proving the recent findings on the Bush family’s involvement with Nazi Germany. It was a good thing that this plot was failed.
2. Operation Valkyrie - The July 20th 1944 plot to take out Hitler which failed.
3. Operation Ajax - an overthrow of the democratically elected leader of Iran by the USA sparked by England when Iran nationalized the Anglo-Iranian Oil Company in which previously Iran was more or less shafted.
4. The Gunpowder Plot - the failed plot to blow up the British House of Parliament because a group of Catholics were fed-up with King James I Protestant rule.
5. The Tuskegee Syphilis Experiment - the United States government was going to monitor the effects of syphilis and perform experiments on those who had a developed form of the disease. The experiments were exclusively performed without consent, and on the very poor, mostly illiterate black males who were not told that they had syphilis and were denied proper treatment for their disease as this would have skewed the results. Additionally, the government promised free burials to those who died.
6. Operation Snow White - During the 1970s, the Church of Scientology decided that their religion about magic space aliens in a volcano wasn’t getting the same respect as the religion about the magic bearded man whose dad made us all out of mud 6,000 years ago. The Church of Scientology the decided to destroy every single document that made their religion look bad, presumably including a trip into the future to destroy every copy of Battlefield Earth.
7. Project MKULTRA - Project MKULTRA was a series of CIA experiments, started on April 13, 1953, in which the CIA tried to figure out how to control your mind. Over a hundred sub-projects were authorized under the MKULTRA heading, though the documents on many of those have been destroyed.

Check out the details here; and whilst you’re at it, you might as well read their list of the ‘5 creepiest urban legends that happen to be true’.