https://thenextweb.com/basics/2020/06/02/7-ways-to-keep-your-personal-information-safe-during-protests/

Protesting in the United States, and in many countries around the world, is a legally protected right — theoretically. But digital surveillance is increasingly being exploited by law enforcement to identify protestors, and threaten privacy, free speech, and due process in the name of crime prevention. 

As Andy Greenberg and Lily Hay Newman wrote for Wired, “You should assume that any digital evidence that you were at or near a protest could be used against you.” Such surveilling methods now include the use of facial recognition, license plate scanners, and predator drones. Officers have also been using smartphones to monitor and build cases against protestors.