Association to ANTIFA once suspected or proven, automatically gives probable cause to investigate and crack open their life. That is uniform across the entire LEO spectrum, local/state/federal.
From a DoD perspective to collect and retain information on a US person, there has to be an exemption. Terrorism is one of the exemptions. When the National Guard is federalized, they go by DoD authorities, not their states.
I used to work counter IED network issues for Uncle Sugar and Intelligence Oversight is a big deal in that area.
Thanks! That was quite informative and helpful.