I've known for decades that the religious right has targeted non-partisan school board seats in order to exert control over public schools, make them shitty & oppressive, and drive people to home schooling and private schools. And I've certainly observed how our current fascists are repeating Nazi tactics like a playbook.
But I didn't know until I read "The Nazi Seizure of Power" that even before the Nazis came to power, they were infiltrating every org they could. https://archive.org/details/naziseizureofpow0000alle_m2p7