Only 12 employees of Tesla are striking i.e. not showing up to work. Those employees might very well be compensated from union dues.
The rest can hardly be called a strike. It's called "sympathy strike" but it's more like "sympathy sabotage.
For example, the postal workers (who are not employees of Tesla but of postal office) are not striking. They are showing up to work, just decided not to deliver mail to Tesla.
Some other company decided to block ships with Tesla cars from entering ports etc.
I doubt this would be legal in U.S. I certainly haven't heard of anything like that.
The rest can hardly be called a strike. It's called "sympathy strike" but it's more like "sympathy sabotage.
For example, the postal workers (who are not employees of Tesla but of postal office) are not striking. They are showing up to work, just decided not to deliver mail to Tesla.
Some other company decided to block ships with Tesla cars from entering ports etc.
I doubt this would be legal in U.S. I certainly haven't heard of anything like that.