The Klansman Mercenaries were supporting antagonists in the 2018 film The First Purge.
When a corporation hired mercenaries to act as purgers to make it seem as the people were in agreement with the Purge, some dressed the part. Some dressed as KKK Klansmen, and acted like them. They can be seen entirely in costume driving a truck holding black prisoners.
The group later attack a shelter of survivors, but the main protagonist, Dmitri, and his gang stab and gun down the group of mercenaries.
The mercenaries were highly skilled with fire arms. They were seen with sub and assault machine guns.