Just look at Detroit.
Check it out:
No wonder they wanted card check: I remember, toward the end of the last Bush administration, whippersnappers all the confident young Dem policy warriors repeating labor’s talking points about the need to allow the secret ballot in union recognition elections to be replaced by “card check,” a system in which workers sign cards in the presence of union organizers. Without card check, management would “coerce” workers by pointing out the downside of unionization in mandatory propaganda meetings.
Wasn’t it possible that workers who turned down unions simply looked at what Wagner Act unionism had done, say, to Detroit, and decided for themselves that this wasn’t what they wanted to happen to their company? Nah.