How is propaganda used to persuade the animals of Animal Farm about Napoleons plans? Is the propaganda effective? If so, why is it effective?

Napoleon, who took it upon himself to educate the young, has created a police force protecting himself and the pigs, and silences opposition. He also has done away with democracy, appointed Squealer as his minister of propaganda, and has set about revising history and law so it benefits the pigs as a ruling class –the replacement of the Joneses and men as the ruling class.