This is someone who uses the classroom to push political views, orientations, or other views for the purpose of indoctrination.
Just recently in TikTok a TEACH-AVIST took down the US flag and told the kids in her class that they could say the 'Pledge of Allegiance' to the pride flag hanging up. Teachavist will have BLM, Antifa, MAGA, ect. propaganda materials or speech in the class.