That's sort of what they are but they're not mercenaries. They are government secret police. Worse.
Oh you mean Gestspo
My understanding is that they are Erik Prince's private contractors. In my book, that makes them mercs.
It is my understanding that a DHS spokesperson indicated they were private contractors.
Written about a recent "deployment."
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Bill Barr’s New “Troops” In D.C. Look Like An Awful Lot Like Erik Prince’s Blackwater Goons
By Denis Elliott -June 6, 2020
@WilliamCharles They aren't. That could happen tho