This is a quote from the book "Animal Farm" by George Orwell
...he dogs sitting round Napoleon let out deep, menacing growls, and the pigs fell silent and sat down again. Then the sheep broke out into a tremendous bleating of “Four legs good, two legs bad!” which went on for nearly a quarter of an hour and put an end to any chance of discussion.

Afterwards Squealer was sent round the farm to explain the new arrangement to the others.

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