Cooper was also a radio host, author and political activist known for his best-selling underground book titled Behold A Pale Horse and his worldwide shortwave radio show Hour of the Time. Cooper was also known for his court battle with the Internal Revenue Service (IRS) and the recorded attempts to dissuade him from pursuing his case.[citation needed] He and Wayne Bentson co-researched the related CAJI News Service brief titled BATF/IRS -- Criminal Fraud where he alleges a history of crimes committed by the Internal Revenue Service, Bureau of Alcohol, Tobacco and Firearms and the Department of the Treasury. The article was first published in Veritas magazine, issue #6, from September 1995. In the article, he asserts that the IRS is actually the same organization as the Bureau of Alcohol, Tobacco and Firearms.

The Mystery Babylon Series is a series of radio broadcast done by William Cooper on the occult history of the new world order. Starting with The Dawn of Man William covers the occult message to the adepts hidden in the movie "2001: A Space Odyssey" where the birth of the "new man" is announced. From there he takes you through the Egyptian mystery religion of Isis and Osiris and on to the beginnings of the secret society networks. From the Assassins to the Freemasons and on down to the Nazis, William Cooper shines the light of truth into the dark corners of the followers of the mystery Babylon religion and those who seek to enslave mankind in a new world order of the ages.
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