The term “redneck” in the early 20th century was occasionally used in reference to American coal miner union members who wore red bandanas for solidarity. The sense of “a union man” dates at least to the 1910s and was especially popular during the 1920s and 1930s in the coal-producing regions of West Virginia, Kentucky, and Pennsylvania.[18] It was also used by union strikers to describe poor white strikebreakers.[19]
From the Wikipedia article on rednecks:
I like how you glossed over the entire first part of the article to try to prove me wrong lmao. Clown.