Green’s Dictionary of Slang

(US black) a member of the racist Ku Klux Klan.

1879		A.W. Tourgée Fool’s Errand 141: Ef dere’s any mo’ Kluckers raidin’ roun’ Burke’s Corners, dar’ll be some funerals tu [DA].
1923		Nation 21 Nov. 570: We are not much impressed with the desireability of organizations specially formed to fight the ‘Kluxers’ [DA].
1933		G. Milburn No More Trumpets 70: The Black Hoods, that bunch of amateur ku kluckers!
1943		W. Guthrie Bound for Glory (1969) 207: You low-down lousy sneakin’ Kluck Klucks! Git th’ hell outta my house! Ol’ ghosty robes!
1944		J.S. Pennell Hist. of Rome Hanks 176: Are you a Klucker, Mr. Ocamb?
1948		Daily Ardmoreite 25 July 20/4: Some 20 more noted Kluxers, anti-Semites, anti-Negroes, anti-foreigners and similar ragtag and bobtail were on hand [DA].
1992		D. Pinckney High Cotton (1993) 30: Cracker youth, ‘Kluckers,’ sometimes rode around in darkened cars, just to frighten people.
2006		C. Carr Our Town 62: It certainly didn’t make him a Kluxer, but he must have known many.