I can't find a good article about them, so I'll just write my own quick summary.
The Melungeons are and were a group of people with a unique heritage. They settled the northern area of Tennessee in what is today known as Hancock County, along Newman's Ridge. Considered a tri-racial isolate, they were oftentimes misunderstood by the suspicious, white valley-dwellers and until the 1969 play that ran for 7 years in Sneedville, TN called Walk Toward The Sunset, the term Melungeon was mainly considered a pejorative. Recent DNA testing has revealed that the ancestry of the Melungoen people is a mix of Eurpoean (mainly Iberian peninsula), sub-Saharan African, and Native American, thus explaining the dark complexion, dark hair and, often, light eyes of the folks pictured in early 1900's photographs, taken by journalists on fact finding trips to Newman's Ridge.
The Goins family in the picture below exhibit the physical traits that had some believing the Melungeons to be freed persons of color in the late 19th and early 20th century. The family names often associated with the group, Collins, Goins, Vardy, etc. can be found all over the areas of Northeastern Tennessee, Southwest Virginia and Kenutcky. Many from these areas now proudly claim Melungeon ancestry and have been participating in the recent Melungeon DNA Project at the behest of Jack Goins, descendant of one of the most prominent of all Melungeon families.
You can find a lot of info. about them on the internet, but most of it has proven to be erroneous with the recent DNA testing proving, definitively, that the Melungeons were not descended from Turkish sailors, as had been believed by many and famously offered in print in a book by Brent Kennedy. So, in your readings, try to find verifiable sources, if you're so inclined to study the
history of these remarkable people.