Animal Farm was a critique of Stalinism and the hijacked Bolshevik revolution more than anything, and it's a good one considering Orwell himself leaned socialist (which Stalinism certainly was not).
It's very interesting to consider that to the extent AF is described as being a critique of Communism, the implicit corollary is that Napoleon's triumph was a systematic inevitability. Few bother to examine the parallels between the Bolshevik and French metaphorical frames, and the latter Napoleon's successful displacement of Sieyes.