All that year the animals worked like slaves. But they were happy in their work; they grudged no effort or sacrifice, well aware that everything they did was for the benefit of themselves and those of their kind who would come after them, and not for a pack of idle, thieving human beings.

George Orwell

Animal Farm. Chapter 6. They didn’t just work like slaves, they are slaves – of Napoleon’s dictatorship. And it was even worse than under Mr. Jones, as Napoleon decrees half rations for any animal that refused to do new Sunday ‘voluntary’ work.