1. GM's Human Resource Dept. was a goon squad, as lal the others had similar policies. Ford tried to pacify his Employees with good pay...

2. (See goon squad above.) Coal miners marching on Washington had their camps machine gunned by the U.S. Army... Snitches were also common.

3. Completely correct.

Similar strategies are still in use today - especially in "Right-to-Work" States.

By the by, it wasn't/isn't just about wages that Unions still organize around today, that is, working conditions, safety, paid sick days, Holidays off with pay, paid vacations, among other topics, are still important to workers and their families.... One problem is illustrated in this chart on the website below... (and there are still suck-ups, "company men," and snitches...)

https://home.treasury.gov/news/featured-stories/labor-unions-and-the-us-economy

I hope this is a satisfactory answer. If not, you know how to reach me.

Organizing by Unions is also up against the maternalism and paternalism woven into the psyche of American Employees