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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Ribbon fall. Gallery forest. You won’t find terms like these in most dictionaries, but they and hundreds like them are discussed by famous writers in the book Home Ground: A Guide to the American Landscape. The book is an intriguing collection...