[criddell]

That's not generally how it works in professional sports with player unions. Nor does it work that way in the film and television industries where there are unions representing writers, directors, actors, etc...

The shape of the union is whatever the membership wants it to have.

[commonlisp94]

Both of those examples have weaker unions that play less of a role. Also the poster above suggested that the union as opposed to the management could measure performance. That doesn't happen in sports or TV.