Professional Educational Organizations

National and Local Teachers Unions

Start with your local association

NCTE

https://ncte.org/resources/ncte-intellectual-freedom-center/

National Council of Teachers of English - Intellectual Freedom Center

PSEA

https://www.psea.org/

Pennsylvania State Education Association

New Jersey Association of School Librarians

https://www.njasl.org/Book-Challenges

Check out the information from NJASL