Fucking Games Workshop, & fucking publishers of music, films, & just about enything else. How DARE you try to claim that a term that was around long before your firm even existed can be your trademark! "Space Marine" was used by Heinlein in a published work not just before your firm existed, but before any of its founders were born. I read the bloody books before your firm was founded. And yet you have the temerity to claim that you own the term, not only as a trademark for gaming, but for all published works! If there's any copyright in it, it belonged to Robert Heinlein at the time you claimed it, you evil, money-grubbing, dishonest, bullying, bastards, & your trademark claim infringed that. And Amazon - FUCK OFF! Can't you afford lawyers? Are you really such lazy, careless, cowardly gits that you'd rather succumb supinely to spurious claims of ownership by such sleazy slimeballs than tell them to stuff their heads where they belong? What is this? No claims of corporate copyright can be questioned? Bah! Humbug! I spit on your corporate crap! Test it in court, you grovelling gits! Games Workshop would back down in an instant (or as soon as it'd got legal advice, whichever was sooner), if anyone with enough cash to take it to court challenged it. It's bollocks. But you're on the side of copyrighting or trademarking everything, aren't you, you spineless scumbags? What next? We'll have to pay you royalties when we mention a river in Brazil?
PS. Even Heinlein (in 1939) wasn't the first. There were published stories using the term "Space Marine" as early as 1932.