Walt Disney himself was a republican who hated unions, communists, and jews. Here is some reading about the formation of the animators unions: https://twitter.com/lysandraws/status/1280660242557046784 https://jacobinmag.com/2017/11/disney-animators-strike-union-busting…
There's an animators union. It covers digital animation now but was originally started at Disney when they made hand drawn stuff. https://animationguild.org/ Some FX workers would be covered by IATSE union divisions https://castifi.com/2020/03/24/list-of-film-industry-unions/