"On May 13, a group of Arizona vigilante ranchers were joined by white supremacist groups from California for a meeting at Sierra Vista, Arizona. The explicit purpose of the gathering was to discuss a plan of action to deal with what the ranchers call "a Mexican invasion" by undocumented workers. White supremacist Glenn Spencer led a contingent of California anti-Mexican racists to the meeting. Spencer, who leads Voices of Citizens Together and a militia called American Patrol, has a long history of racist activity aimed at Mexican immigrants. Through the Internet, radio and other propaganda, Spencer warns against "Mexicans trying to takeover the United States." Vigilante rancher Roger Barnett also attended the meeting, joined by the Arizona 9th District of the Imperial Wizards of the Ku Klux Klan."