Afterwards Squealer made a round of the farm and set the animals’ minds at rest. He assured them that the resolution against engaging in trade and using money had never been passed, or even suggested. It was pure imagination, probably traceable in the beginning to lies circulated by Snowball. A few animals still felt faintly doubtful, but Squealer asked them shrewdly, ‘Are you certain that this is not something that you have dreamed, comrades? Have you any record of such a resolution? Is it written down anywhere?’ And since it was certainly true that nothing of the kind existed in writing, the animals were satisfied that they had been mistaken.

George Orwell

Animal Farm. Chapter 6. Napoleon’s minister for propaganda, the silver-tongued Squealer, convinces the animals that a rule against trade with humans never existed. He scapegoats the expelled Snowball, whom he says spread the rumor and the lie.