George Orwell once wrote: “Every line of serious work that I have written since 1936 has been [...] against totalitarianism.” Animal Farm, Orwell’s tale of the titular farm animals’ takeover of a provincial English farm and their development of a totalitarian state there, is no exception. Totalitarianism is a form of government in which the state seeks to control every facet of life, from economics and politics to each individual’s ideas and beliefs.
https://www.litcharts.com/lit/animal-farm/themes/totalitarianism
Animal Farm is established with good intentions. The animals rise up to overthrow Jones and envision a society based on the teachings of Old Major, in which all animals will be equal and the exploitation of the many by the few (i.e. people) will cease. But by Chapter Seven, it is obvious that the animals' experiment has become a totalitarian nightmare.
https://www.enotes.com/homework-help/what-makes-animal-farm-totalitarian-society-please-356280