Also Vaclav Havel, "The Power of the Powerless":

The manager of a fruit-and-vegetable shop places in his window, among the onions and carrots, the slogan: “Workers of the world, unite!" Why does he do it? What is he trying to communicate to the world? Is he genuinely enthusiastic about the idea of unity among the workers of the world?...

That poster was delivered to our greengrocer from the enterprise headquarters along with the onions and carrots.... If he were to refuse, there could be trouble. He could be reproached for not having the proper decoration in his window; someone might even accuse him of disloyalty. He does it because these things must be done if one is to get along in life. It is one of the thousands of details that guarantee him a relatively tranquil life “in harmony with society,” as they say.