Below are a couple of allegorical actions by Napoleon.
1. Napoleon turns the animals against Snowball, runs him off the farm, and then blames him for negative events that occur on the farm. This series of events represents Stalin's (Napoleon) running Trotsky out of Russia and then blaming him and "insurgents" for subversive of questionable activities that occurred in Russia after Trotsky's exile.
2. When animals, such as the hens, oppose new policies enacted by Napoleon, he sets his dogs upon them so that all opposition will be silenced (normally permanently). Simlarly, Stalin is notorious for his gulags (prisons) and executions reserved for those who dared to speak out against his policies or question past promises.