A short animated parable actually critical of following establishment rules and red tape problems.

Walt Disney - Pigs Is Pigs - 1954 (9:43)
~ LPmangas, 2008-01-20

 

Pigs Is Pigs is a 1954 animated film by Walt Disney Studios. Based on the story "Pigs Is Pigs" by Ellis Parker Butler, it relates the tale of a railway agent and his problems with a shipment of two guinea pigs that proceed to breed rapidly. This was Gary Owens' film debut.[citation needed] The cartoon was animated in the flat, colorful UPA Style. The melody of the traditional Irish jig The Irish Washerwoman is repeated throughout the short.

It was nominated for an Academy Award for Best Animated Short Film.

~ https://en.wikipedia.org/wiki/Pigs_Is_Pigs_(1954_film)

https://www.imdb.com/title/tt0047353/ 7.1/10

 

The UPA animation studio was faaaaar more influential than any studio in history (mostly the 40s-60s) as far as I'm concerned. Disney, Warner Brothers, and everyone else copied and emulated them.
https://en.wikipedia.org/wiki/UPA_(animation_studio)
https://duckduckgo.com/?q=UPA+(animation+studio)&iar=images

 

More on:
https://en.wikipedia.org/wiki/Pigs_Is_Pigs