are all members of a union...
AFTRA...
oops...
oh yeah.. so are Michelle Malkin, Annie Coultergeist, Glenn Beck and Sarah Palin...
As is everyone on TV/Radio because the unions have an absolute grip on entertainment. You cant get on if your not SAG. Hell, you cant even APPLY to become an extra unless you pay and go through an unionized talent agency. Even then, you aren't allowed to have a speaking part or any other major role unless your SAG. I've been an extra on more than a few occasions. Once you do three jobs as an extra you can apply for SAG membership and pay your dues. Only then are you allowed to advance with acting or speaking parts.
Screen Actors Guild‐American Federation of Television and Radio Artists (SAG-AFTRA)