His books were required reading in College in the 1960s, as were Marx and Ayn Rand.
The book is not about Communism/Stalinism or Nazism. It is about totalitarianism that goes beyond Communism/Stalinism and Nazism, which are implemented to lead to a paradise. Winston faced totalitarianism which was object of totalitarianism. The object of power is power.
The 50th edition of animal farm has an essay by him that spells it out.
He’d fought on behalf of Socialism but became disillusioned when he saw US and UK Communists denying or accepting the horrors of Stalinism (later Mao and Che).
There are Communists in the West who want the existing culture (people and history) DEAD.