It's not enough to say they are allowed, but determining what constitutes sabotage or impeding this right when voting to unionize with a company, is the issue t

It's not enough to say they are allowed, but determining what constitutes sabotage or impeding this right when voting to unionize with a company, is the issue the USLB addressed. How do you ensure that your unionizing vote (which includes details of how the union will operate, since they each have their own charter), is fair? You have to get the parent company involved, otherwise you might be disenfranchising eligible voters/members and/or involving outside parties. This is where it gets ugly because the company (usually) has a vested interest in observing that the vote fails.