Uldragor

The Uldragor were an easterling people in Rhûn in the early second Age led by a chieftain called Uldor Red-eye.Originally a tribe in their own right they later became a mixed band carrying out bloodwork for the Shrel

speculations
The Uldragor may have been related to the Borians and Uldorim and thus the Baradhrim and Shrel.