What happens to the hens when they threaten Napoleon's power in animal farm?

When the hens threaten Napoleon's power by revolting against his decision to sell their eggs, he responds with harsh measures. He cuts off their rations and uses the dogs to intimidate them, ultimately leading to the execution of several hens who resist. This brutal crackdown reinforces Napoleon's authoritarian control and demonstrates the extent he will go to maintain power over the other animals. The incident illustrates the theme of oppression and the betrayal of the rebellion's original ideals.