The touchstone would probably be Heinlein's Starship Troopers which, after 55 years, still provokes debate even about whether it's fascist or not.
I'm not sure how precisely you mean "fascist" (vs. just evil oppressive Powers That Be) and how subtle you want (ambiguous, downright favorable?) or how central it needs to be to the book. But some things that occur to me are John Barnes' Orbital Resonance (father knows best), many of Stephen Baxter's Xeelee stories (where humanity sometimes becomes things many of us wouldn't like under xenocidal pressures), maybe even Budrys' Michaelmas (where it's not really the point but there's an odd way of looking at it), Jack Williamson's velvet-glove The Humanoids ("With Searching Mind"/"And Folded Hands"), and Haldeman's "peace at any cost" Forever Peace. Also Cory Doctorow's "Chicken Little" could be seen as relevant, I guess. There are a lot of "bread and circuses", "most of the herd is content" sorts of stories though individual titles aren't springing to mind. Lots of van Vogt might fit what you're talking about but maybe some more detail or restrictions would clarify. Or do you just want "not 1984 clones"?
Oh, I forgot - it's not subtle at all but an essential book on "science fiction (especially heroic fantasy, actually) and fascism" is Norman Spinrad's The Iron Dream. This pretends that Adolf Hitler left Austria after WWI and became an SF hack in America and wrote the enclosed novel, Lord of the Swastika. It touches on how much of space opera, heroic fantasy, and nursery tales and Nazism and other sorts of "great hero ruler smashes the inhuman" stories have a level of kinship. This isn't precisely related to just fascism as such, but it's definitely in there.