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State and local teachers' unions said they will file a suit against the accrediting agency that is threatening to shut down CCSF next summer. (Alex Emslie/KQED)

State and local teachers’ unions said they will file a suit against the accrediting agency that is threatening to shut down CCSF next summer. (Alex Emslie/KQED)

State and local teachers’ unions said they will file a suit against the accrediting agency that is threatening to shut down CCSF next summer. (Alex Emslie/KQED)