I'm currently reading a volume of 'The Worlds Of Philip José Farmer' & it reprints a fascinating article about how in 1953 'Science Fiction Plus' magazine printed a story under Farmer's byline which just simply didn't bear much resemblance to the story he submitted. The heavily "edited" version they printed was really bad & garnered Farmer some terrible reviews. I put "edited" in inverted commas, because we're not talking about editing here. We're talking about rewriting, adding stuff Farmer didn't write, in fact totally changing the story (and not for the better) without bothering to even inform the author, let alone asking permission.
It's an odd & depressing coincidence, that I then come across this story of how a current indie publisher has given a new author the exact same treatment in 2012.http://mandydegeit.wordpress.com/2012/05/14/when-publishing-goes-wrong-starring-undead-press/