Considering that license plates exist specifically for the purpose of recognition (originally by human observers), I don't think it's news in 2020 for anyone to be identifying them via machine vision. If you have a Raspberry Pi and a Pi Camera, you too can participate in this kind of surveillance.
"Antifa" seems to be a symptom of fascism and racism -- like an elevated white blood cell count in response to an infection. I'm not sure the organization even exists. It certainly wasn't a major part of the national dialogue prior to that fatal rally in Charlottesville.