A 1921 application form to join the racist Ku Klux Klan organisation has emerged, which asks ‘are you of the white race or of a colored race?’ The form asks a further 19 questions ranging from the mundane, such as ‘what is your age?’, to the overtly sinister – ‘Do you believe in White Supremacy?’ At the top is an introduction implying that it is intended to be sent out to people whose friends have identified them as suitable recruits. Scroll down for video . A 1921 application form to join the racist Ku Klux Klan organisation has emerged . The form was purchased at an ephemera show – where collectibles are sold – by Delaware rare book dealer Ian Brabner, whose firm, Rare Americana, buys and sells 18th to early 20th century rare books and historical manuscripts. In a blog post Brabner explained that the numbers ‘8-2-21’ in the top left corner of the unused form would have stood for the date – August 2, 1921. He wrote: ‘You can assume there’s a fair amount of xenophobic sentiment and anxiety about the waves of immigration to America, in 1921, post World-War One. ‘On May 9, 1921, this was evidenced when Congress passed the Emergency Quota Act, aka, the Emergency Immigration Act of 1921 to counter the increased immigration to America.’ The form is ominously titled ‘Invisible Empire’, an alternative name for the clan at the time, born from founder Nathan Bedford Forrest’s claim that the group was ‘invisible’. The KKK was founded in 1866 in Tennessee, with Nathan Bedford Forrest becoming the first leader, or grand wizard, in 1867. Pictured are clan members in 1965 . The KKK's membership peaked in the 1920s at around four million. Today it's thought to number in the low thousands . It then says ‘we have been requested by one of your personal friends to get in touch with you, and inform you of this organisation’, before listing 20 questions to be answered. They also include ‘do you believe in the principles of a PURE Americanism?’, ‘are you a gentile or Jew?’ and ‘were your parents born in the United States of America?’ The KKK was founded in 1866 in Tennessee, with Forrest becoming the first leader, or grand wizard, in 1867. Its membership peaked in the 1920s at around four million. Today it's thought to number in the low thousands, with most people affiliated with it living in America's Deep South. It was recently revealed, meanwhile, that California had more active hate groups than any other state last year. According to the Southern Poverty Law Center (SPLC), California has 57 such groups, followed by Florida with 50, New York with 44, New Jersey with 40, and Pennsylvania with 38. Rounding out the top five were Texas with 36 hate groups, Tennessee with 29, Georgia with 28, and Virginia and Ohio tied with 27 each. Hawaii and Alaska were the only states to not have any hate groups, according to the SPLC. The organization said on its website 'All hate groups have beliefs or practices that attack or malign an entire class of people, typically for their immutable characteristics. 'This list was compiled using hate group publications and websites, citizen and law enforcement reports, field sources and news reports. 'Websites appearing to be merely the work of a single individual, rather than the publication of a group, are not included in this list,' the organization wrote. 'Listing here does not imply a group advocates or engages in violence or other criminal activity.' Nationally, the SPLC said in its 'The Year in Hate and Extremism' report, which was published online this spring, that there were a total 784 active hate groups in the US. The non-profit said there were 72 Ku Klux Klan groups, 142 neo-Nazi groups, 115 White Nationalist groups, 119 racist skinhead groups, 21 Christian identity groups, 37 neo-confederate groups, 113 black separatist groups, and 165 general hate groups.
Delaware rare book dealer Ian Brabner bought the form at ephemera show .
It's dated August 21, 1921, and lists 20 questions for potential KKK recruits .
Questions include 'are you a Jew?' and 'do you want white supremacy?'