This man was documenting everything that went on; he was unresponsive to any communication when regular people would attempt to talk with him. I believe this was yet another undercover. Notice how the badge around his neck is purposely hidden. He avoided all attempts to be photographed. While the march had a scaled back obvious police presence; the obvious undercover presence was beefed up to a degree not previously seen. Always act as if an agent is in your presence. Never say anything that you would not say to law enforcement when you are in public; esp. at marches. What your backs; watch the backs of your brothers and sisters.