1868; Ku Klux Klan is a Hebrew term

From a book published in London in 1868, but apparently from a journal first published in Memphis:

Ku Klux Klan is a Hebrew term, and, if not found in the Talmud, is met with a very old Jewish work, entitled A True and Authentic History of the Great Rebellion of the Hebews against the Ancient Egyptian King Pharoah, B. C. 2000. In this work the orthography is thus: 'Cu Clux Clan ;' and is interpreted in the English language, the Straw Club, which is supposed to allude to the fact that Pharoah required the hod-carriers to furnish their own straw, and also to the proverb, known to be of ancient Hebrew origin, "Straws show which way the wind blows."

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THE LATTER-DAY SAINTS' MILLENNIAL STAR VOLUME XXX (1868)

Jews were allowed to join the original Ku Klux Klan