How does Orwell illustrate the theme of power and corruption?

Orwell illustrates the theme of power and corruption primarily by showcasing the moral decline of the pigs. As the story progresses, the pigs, who are initially seen as the leaders of the revolution, begin to adopt the very traits and behaviors they initially opposed. The pigs, particularly Napoleon and Squealer, become increasingly authoritarian, manipulating the other animals and distorting the revolutionary ideals of equality and justice. This moral decline is symbolized through their actions, such as altering the commandments of Animalism and indulging in human-like behaviors, which ultimately lead to a complete betrayal of the original principles of the revolution. Their transformation from revolutionary leaders to oppressive rulers is a stark representation of how power can corrupt and change individuals, highlighting the broader theme of how noble causes can be co-opted for selfish ends.