> I assume they must work to some degree, or they wouldn't do it.
I wouldn't be so sure. Unionization is usually rare in the US, and combatting it therefore won't have much evidence to go on. So you end up with crazy people making shit up and seeing what sticks. Like the guy working for Oregon's negotiation team who created fake aliases 'Aanus McFadden' and 'Roy Vragina' to post anti-union messages on social media: https://www.wweek.com/news/2019/08/06/oregon-health-and-scie...
I wouldn't be so sure. Unionization is usually rare in the US, and combatting it therefore won't have much evidence to go on. So you end up with crazy people making shit up and seeing what sticks. Like the guy working for Oregon's negotiation team who created fake aliases 'Aanus McFadden' and 'Roy Vragina' to post anti-union messages on social media: https://www.wweek.com/news/2019/08/06/oregon-health-and-scie...