Regarding 1984: after encountering the rise of the communist and fascist regimes of Hitler and Stalin, Orwell adopts this transgression of the future promises as they become the illusions of a utopia
Is transgression used correctly in this sentence?
If not, pls change or add word choice so that it makes sense.
Your sentence needs revisions. It is best to rewrite such a problem sentence more than once. Finally, with luck and patience, you may arrive at an approximation of what you mean.
The first part of your sentence should read:
After observing the rise of the communist and fascist regimes of Stalin and Hitler . . .
Then you might say:
Orwell exposes the broken promises about the future as impossible utopian illusions.
So the entire sentence might read:
After observing and studying the rise of the communist and fascist regimes of Stalin and Hitler over many years, Orwell exposes the leaders' broken promises about the future as hopeless utopian illusions.
I am not completely satisfied with my version, but you might tinker with it some more. Good writing is usually rewriting.