Of course wealthy Hollywood celebrities support unions: they make it harder for outside talent to compete with them. And they absolutely do limit the work that

Of course wealthy Hollywood celebrities support unions: they make it harder for outside talent to compete with them. And they absolutely do limit the work that union members are carrying out. To name a fairly recent example, that's how Dr. Horrible's Sing-along Blog came into existence, making it a web series allowed Joss Whedon to still make something without running afoul of the Writer's Guild strike rules.