Back in 1972, the late Gary Allen, a former high school history teacher, published his book None Dare Call It Conspiracy While it was never listed on the New York Times‘ Best Seller List, it sold over 6 million copies. It is still in demand on Amazon and other on-line book dealers. Here is a link to a PDF of the book: https://campconstitution.net/wp-content/uploads/2011/02/None-Dare-Call-It-Conspiracy.pdf
And a link to an audio of a presentation conduced by Gary Allen:
https://www.podomatic.com/podcasts/shurtleffhal/episodes/2017-10-01T18_26_18-07_00