"And so should all Americans be frightened by these communist tactics. We don't do this in the US!"
1. These "tactics" are not exclusive to "communists" but rather used by government all over the world.. from facists to Islamist to democratic republics. Your use of the term "communist" suggests that your argument is so weak that you have to hurl that term as an "insult".
2. There is no expectation of privacy at a protest. None. In fact, you WANT the gov't to know that you are unhappy.
3. This would allow police to accurately identify wrong-doers. What is wrong with that?
There is absolutely NO idea that the gov't will use this to "target" protesters, a la FBI under J.E Hoover.
Never thought I'd see FReepers defending communists tactics, and yes that's what this is, on this site. By your reasoning there's no problem with identifying the people in the photos and running an FBI check on them. I mean why else would you take the photos if you weren't going to try to identify the people? You'd make a good little communist. Hillary and Putin would be proud to have you as their comrade.