[olavk]

Even Encyclopædia Brittanica uses Animal Farm as an example of Allegory: https://www.britannica.com/art/allegory-art-and-literature.

[posterboy]

Yes, I meant "Indeed, they are not; It is not (the case that ...)". They being Stalin etc. The Stalin is not an abstract concept, communism is. And to liken communists to pigs is a metaphor.