https://www.foxnews.com/us/teachers-union-sues-rhode-island-mom-critical-race-theory
I'm a teacher, have been for 30+ years. I have never put private information in a communication using my district email. Any documents I have created using district resources especially those stored on district servers I have no expectation of privacy.
Why would I care if anyone wanted to look at my curriculum documents? Almost all are online already so students can access them.
Anything a teacher is doing but wants hidden from parents is highly suspect.