Hovind has several conspiracy theories about the U.S. government. He has claimed that the U.S. government was behind the &lt;a href="9/11%20attacks"&gt;9/11 attacks&lt;/a&gt; and the Oklahoma City bombing. Regarding UFOs, Hovind recommends books by conspiracy theorists who believe "some UFO's are U.S. Government experiments with electrogravitic propulsion as opposed to jet propulsion, while others are Satanic apparitions." The Southern Poverty Law Center (SPLC) criticized Hovind for referring followers to books by Irwin Schiff, a tax protester who has been convicted of tax evasion multiple times. The SPLC has criticized Hovind for "point[ing] his followers to "Citizens Rule Book", popular among antigovernment 'Patriots', and to "Media Bypass", an antigovernment magazine with strong antisemitic leanings", and for selling of books such as Des Griffin's "Fourth Reich of the Rich" and Peter Kershaw's "In Caesar's Grip", and recommending "The Protocols of the Elders of Zion", a well-known antisemitic hoax.