See the guy running up to the police flashing the red card? The German above says something like “Yes, it's silly when the uniformed officers don't recognise their own "provocateurs" - not even by the red note in their hands and they get a full load of pepper... runs!”
Ah Yes, I recognise this from the Victorian Police Handbook. Chapter 3: Maintaining Public Health And Safety Methods.
Antifa = bolsheviks. When they try and take over give them no quarter.