what does the windmill symbolise to the animals of animal farm?

The great windmill symbolizes the pigs’ manipulation of the other animals for their own gain. Despite the immediacy of the need for food and warmth, the pigs exploit Boxer and the other common animals by making them undertake backbreaking labor to build the windmill, which will ultimately earn the pigs more money and thus increase their power. The pigs’ declaration that Snowball is responsible for the windmill’s first collapse constitutes psychological manipulation, as it prevents the common animals from doubting the pigs’ abilities and unites them against a supposed enemy. The ultimate conversion of the windmill to commercial use is one more sign of the pigs’ betrayal of their fellow animals. From an allegorical point of view, the windmill represents the enormous modernization projects undertaken in Soviet Russia after the Russian Revolution.