The Animation Guild is a good model.

Disney, whose animators have been unionized since the 1950s, bought Fox's animation operation and is trying to run it non-union. They're refusing to bargain with TAG, even though Disney has recognized the union.[1]

There aren't that many animation studios left. Most either went out of business or were bought by Disney. The remaining Hollywood unionized animation studios are Disney, Sony, Nickelodeon, Rick and Morty, Titmouse LA/Robin Red Breast Production, and WAG Pictures, Inc.

Despite repeated attempts, TAG has been unable to unionize game developers.

[1] https://actionnetwork.org/petitions/support-unionized-worker...

I'm surprised Rick + Morty is its own thing. Wouldn't they be part of [adult swim] (Warner)?

Is R+M in Hollywood while the rest is run from Atlanta?

ASIFA is not a labor union in any way and local 839 is not really a VFX union, nor does representation function like SAG or WGA do. VFX is a mess.