Who are the 'wild men'?

[Kuruharan]

Originally Posted by William Cloud Hicklin

The Dunlendings' alleged grievance might have been a piece of Sarumanic propaganda. Or maybe not: but Tolkien on the whole, in both his fiction and his letters, seems to be very much opposed to imperialism, including the British Empire. It would be surprising to me if he had not made more explicit the legitimacy of the Dunlendings' complaint if it had any, as he certainly did with regard to the Woses.

A good point, although I don't think the Dunlendings were high on Tolkien's list of priorities when it came to fleshing out back stories.

Was there something written at some point about the Dunlendings being related to the Men of the Mountains?