[1]: https://www.nytimes.com/2020/06/11/us/antifa-protests-george...
[2]: https://www.politico.com/news/2020/09/04/white-supremacists-...
https://thehill.com/opinion/criminal-justice/575658-fbi-shou...
https://www.newsweek.com/concerned-about-your-childs-school-...
Don't rely so heavily on "fact checks" - their sole raison d'etre is to provide ammo to the "official" narrative peddlers nowadays. Read the original letter.
Edit: All of the recent FBI stories I can find are about a manhunt for a (presumed) murderer or about the nuclear espionage case.
Edit 2: This is the only reference I was able to find[1]. It sounds like the current governor of Florida falsely claimed that the FBI is "going after" parents. It's not clear what "going after" means, or where that came from.
[1]: https://www.politifact.com/factchecks/2021/oct/11/rick-scott...
> Same FBI that's about to start arresting "terrorist" parents for having the temerity to speak at school board meetings? That FBI?
As for the new links: they're both opinion pieces, both of which are (vague) handwringing that don't support the more outrageous claim being made (that the FBI is about to "start arresting [...] parents").
The closest thing I can find to actual reporting on this says that Garland (who's DoJ, not FBI) wrote an advisory memo[1]. The memo itself is a broad announcement to multiple federal agencies notifying them to coordinate with local agencies in cases of harassment against educators. Not exactly shocking stuff.
Tip: there's a toggle on the page where you can get the raw text of the document, then use ctrl+f.