It seems that nobody has mentioned George Orwell so far
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1984 or Animal Farm sometimes seem to be describing problems we are experiencing now (or might experience in not so distant future), although they were written a few decades ago. I like his Homage to Catalonia too. In it, he recounts his experience from Spanish Civil War (another famous piece about the conflict is Hemingway's For Whom the Bell Tolls).
And I like classics too. One of my favourites is Dante Alighieri and his Divine Comedy with all its mind-blowing imagery, especially in Inferno
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