All animals are equal, but some animals are more equal than others." This quotation is an excerpt from which literary work?

This is a quotation from George Orwell's allegorical novel Animal Farm.

Animal Farm: 
- It is an iconic animal/Political fable written by him.
- Anti-utopian satire by George Orwell, published in 1945.
- It is a political fable based on the events of Russia’s Bolshevik revolution and the betrayal of the cause by Joseph Stalin. 
- The book concerns a group of barnyard animals who overthrow and chase off their exploitative human masters and set up an egalitarian society of their own.
- Eventually the animals’ intelligent and power-loving leaders, the pigs, subvert the revolution.
- Concluding that “all animals are equal, but some animals are more equal than others .

Source: Brtitannica.com