Walmart is infamous for shutting down stores that unionize. This can be particularly devastating to the community because Walmart's whole schtick is to wipe out every other business in the area through "dumping" - flooding the market with stuff sold at a loss until they drive the other companies out of business.

So not only do a lot of people in town / the county lose their jobs, but they lose the only place to shop for a lot of things.

Result? Anyone who talks about unionizing gets reported, or simply ostracized. "Shut the fuck up, Jim. You wanna get the place shut down? We'll all be driving an hour to get our groceries."