[wpietri]

Unions can definitely influence them. E.g., that's a big part of the point of the German Betriebsrat: https://en.wikipedia.org/wiki/Works_council#Germany

[parineum]

Unions can influence them only while they're in CBA negotiations unless they negotiate a seat at the table, as in your example, which is not something that is at all common in the US.

[wpietri]

Formally, that's true. But as we see in the writer's strike, unions definitely try to influence business decisions, and sometimes they succeed.