In theory, Tesla might actually be the weaker party in this case. An industry-specific union is known in textbook economics as a labor cartel, or as a device which holds labor hostage.

While historically they were necessary, today fewer examples exist of employees as the captive market--where a union makes sense. In other words, many times it is the employer who is taken advantage of.

If unions were open and free to join for all people, I mean that would be one thing; but they are not. Membership is dependent on things such as family. They're tough and politically correct, but regressive and unfair.