head-knocker
n.— «The man who arranged Moore’s murder was most probably Joseph Neville Cox, the secretary of the Orlando chapter of the Ku Klux Klan, who organized a handful of Klan “head-knockers,” as they were called, arranged to purchase dynamite (which in those days was sold in many hardware stores in Florida) and have it placed beneath Moore’s bedroom.» —“Another Klan bites the dust” by Sam Johns in Jackson, Mississippi BlackNewsWeekly (Chatanooga, Tennessee) Aug. 27, 2007. (source: Double-Tongued Dictionary)
Further reading
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