Eric Flint specifically talks about his long-term support for unions in one of the prefaces (I think) of the early books in the series, quite likely 1632 itself

Eric Flint specifically talks about his long-term support for unions in one of the prefaces (I think) of the early books in the series, quite likely 1632 itself. He's worked in a union as a longshoreman, truck driver, auto worker, steelworker, meatpacker, glassblower and a machinist and was a labour union organiser.