A former self-proclaimed member of the neo-Nazi National Alliance, Mahon joined the Ku Klux Klan (KKK) in the early 1980s, and he served as imperial dragon of the Oklahoma White Knights of the Ku Klux Klan. He also led Klan groups with presences in Oklahoma, Kansas, and Missouri. From 1985-1989, he claims to have attended meetings of the Klan and the neo-Nazi Aryan Nations.

Mahon joined white supremacist Tom Metzger's group White Aryan Resistance (WAR) in the early 1990s and became a significant figure in the group. Metzger wrote of Mahon that he “is a long time fighter and contributor to the Racial issue. As a Klan leader or member, And [sic] later a W.A.R. associate his service to the cause has been large.”

Mahon edited and published White Beret and The Oklahoma Excalibur (“A Sword of White Aryan Resistance”), virulently anti-Semitic and racist newsletters. He also operated a “Dial-A-Racist” hotline from Oklahoma.

At one point, Mahon kept a trailer at Elohim City, a racist and anti-Semitic Christian Identity settlement in Adair County, Oklahoma which has attracted several violent extremists. After the Oklahoma City bombing in 1995, Mahon expressed support for Timothy McVeigh, who Mahon claimed to have met at a gun show. According to one report, during an extremist event in 2004, Mahon explained, “I knew Timothy McVeigh quite well. In fact, I knew him back when he was named Timothy Tuttle…and he and I were involved in quite a few bom…Let's just say he and I did some serious business together. And after Oklahoma City, the feds came after me big-time, boy, but they never proved a thing.”

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