The US tries to thread the needle between being "pro management" and "pro labor".
Historically, the bargain that has been struck is that current employees have substantial protections around union organizing.
However, outside unions have limited rights to directly solicit employees.
That's at the federal level. At the state level, additional pro-union rights may layer on top of that (e.g. in the northeast) or not (e.g. in the southeast).
Additionally, since you mentioned Germany, most US workers do not have a seat at the management table, in contrast to how I believe German companies are typically organized?
Historically, the bargain that has been struck is that current employees have substantial protections around union organizing.
However, outside unions have limited rights to directly solicit employees.
That's at the federal level. At the state level, additional pro-union rights may layer on top of that (e.g. in the northeast) or not (e.g. in the southeast).
Additionally, since you mentioned Germany, most US workers do not have a seat at the management table, in contrast to how I believe German companies are typically organized?