Board Thread:Suggestions forum/@comment-34241117-20180121233035/@comment-26149161-20180122012946

I'm going to quote what the site "Ask About Middle Earth" says:

"The most detailed discussion of evil dwarves that we get is a note in the essay “Of Dwarves and Men”. When discussing the first meetings between men and the dwarves of the Misty Mountains, Tolkien says that the men (having recently arrived from the east) were a little wary of the dwarves, “fearing that they were under the Shadow.” Tolkien then expanded on this in a note, saying: 

'For they had met some far to the East who were of evil mind… Alas, it seems probable that (as Men did later) the Dwarves of the far eastern mansions (and some of the nearer ones?) came under the Shadow of Morgoth and turned to evil.'

'' So it seems that at least some of the eastern dwarvish clans fell under Sauron’s control (much like most of the men of the east.) I think this note is especially interesting when compared to the note from the appendices that suggests this story wasn’t universally believed. Did perhaps the western dwarves deny that any of their kin served Sauron? It’s possible that whatever hold Sauron had over the dwarves in the First and Second ages wasn’t revived in the Third Age. If that’s the case, then by the War of the Ring it’d been thousands of years since a dwarf served Sauron. I wouldn’t be surprised if the dwarves had “erased” that part of their cultural history by then.''

 Ithilion, Discussions Moderator (Auta i lómë)