Sounds like a unit from the 1960's.

"Are they using private contractors? Are they using political volunteers?" Waller said to the outlet. "Are they using paid agents of different types? We don't know. This is something the public has a right to know, and we need to get to the bottom of it. If the D.C. Police is running electronic surveillance on American citizens without warrants, this could be a very serious breach of our civil liberties."
ESU members wore a specific "bracelet on their left wrist identifying them as MPD personnel" so that other security personnel could recognize them while embedded among the protesters, the report said."

https://www.newsmax.com/newsfr....ont/plainclothes-pol