Frazier Glenn Miller, 73, of Aurora, Mo., was arrested today for the murder of three people at two separate Jewish Community Centers in Overland Park, Kan. Miller, who was arrested using the alias Frazier Glenn Cross, has been in the movement nearly his entire life. Miller is the former “grand dragon” of the Carolina Knights of the Ku Klux Klan, which he founded and ran in the 1980s before being sued by the Southern Poverty Law Center (SPLC) for operating an illegal paramilitary organization and using intimidation tactics against African Americans.

After subsequently forming another Klan group, the White Patriot Party, he was found in criminal contempt and sentenced to six months in prison for violating the court settlement. He went underground while his conviction was under appeal but was caught by the FBI with a weapons cache in Missouri. He served three years in federal prison after being indicted on weapons charges and for plotting robberies and the assassination of SPLC founder Morris Dees. As part of a plea bargain, Miller testified against other Klan leaders in a 1988 sedition trial.

Miller is a raging anti-Semite who has posted more than 12,000 times on Vanguard News Network (VNN), whose slogan is “No Jews, Just Right.” VNN founder Alex Linder has openly advocated “exterminating” Jews since December 2009. Miller, a close partner to Linder, has called Jews “swarthy, hairy, bow-legged, beady-eyed, parasitic midgets.” Miller is also one of VNN’s largest donors and he printed and distributed thousands of copies of VNN’s newsletter, The Aryan Alternative.

This isn’t the first time a VNN user has been arrested for violence. On January 17, 2011, less than 12 hours after posting on VNN, Kevin William Harpham placed an improvised explosive device concealed in a backpack along a Martin Luther King parade route in Spokane Washington. The lead sinkers in the radio-detonated IED were coated with Warfarin rat poison, evidently intended to increase bleeding. Had the device functioned, dozens of men, women and children would have been killed or injured. Harpham also distributed The Aryan Alternative.

Our research shows that racist killers are hiding among us in plain sight. A forthcoming two-year study by the SPLC will show that nearly 100 people in the last five years have been murdered by active users on another prominent racist website, Stormfront.org.

In a phone conversation with his wife Marge, who has apparently never been active in the white supremacist movement, the SPLC was able to confirm that Miller had gone to a local casino in Missouri yesterday afternoon. He called his wife this morning at about 10:30 AM to tell her his winnings were up and all was well. She has not heard from him since, but law enforcement was at her door at 8:30 PM and she told the SPLC that they told her Miller was arrested for the shootings.

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This post originally appeared on our Hatewatch blog.