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Both brothers have a long history of involvement in the white supremacist movement. Dennis Mahon held leadership positions within various white supremacist groups in the Midwest in the 1980s and 1990s, including the Ku Klux Klan and White Aryan Resistance (WAR), a now-defunct group led by well-known racist Tom Metzger. Metzger has long advocated “lone wolf” activity. According to the lone wolf model, individuals and small cells engage in activity that leave behind the fewest clues for law enforcement authorities, decreasing the chances that activists will end up getting caught.
Dennis Mahon reportedly moved to Arizona from the Midwest in 2001 to establish WAR’s presence in the area. His brother Daniel joined him in Arizona.
Daniel Mahon was also an active white supremacist. In May 1999, according to court papers, American Airlines fired him after he violated written work rules that “prohibited threatening and intimidating behavior toward other employees and conduct detrimental to other employees and American Airlines.” Mahon was under investigation by the company for his activities related to his participation in a “Caucasian Employee Resource Group.”
ADL provided assistance to investigators throughout the lengthy case.