Chinyere Tutashinda passes out visitor passes and peacekeeping positions at Castlemont High School in East Oakland.

As Norman Ospina, the school attendance clerk and a translator at Castlemont High School in East Oakland, crossed the courtyard on a crisp overcast fall morning, he spotted a young man he believed had been involved in a campus brawl on September 21. Ospina, whose students call him “Mr. O,” placed his index finger over…

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