In Scotland in the 1640s, the Covenanters rejected rule by bishops, often signing manifestos using their own blood. Some wore red cloth around their neck to signify their position, and were called rednecks by the Scottish ruling class to denote that they were the rebels
Dictionaries document the earliest American citation of the term's use for Presbyterians in 1830
By 1900, "rednecks" was in common use to designate the political factions inside the Democratic Party comprising poor white farmers in the South (for they opposed the rich men, who wore expensive silk hats)
The United Mine Workers of America (UMW) and rival miners' unions appropriated both the term redneck and its literal manifestation, the red bandana, in order to build multiracial unions of white, black, and immigrant miners in the strike-ridden coalfields of northern and central Appalachia between 1912 and 1936.
Red Neck, which recounts the story of a charismatic union leader named Dave Houston and an unsuccessful strike by his fellow union miners in the fictional coalfield town of Laurel, Pennsylvania. The word's varied usage can be seen in the following two examples from the book. "I'm not much to be proud of," Houston admits to his admiring girlfriend Madge in one scene. "I'm just a red necked miner like the rest." In another scene, a police captain curses Houston as a "God-damned red neck" during a fruitless jailhouse interrogation, before savagely beating him with a sawed-off chair-leg.