(JTA) — Students at one of Chicago’s most selective public high schools are calling for improved Holocaust education after a classmate goose-stepped across the stage of a Halloween costume contest while wearing a German military uniform.

The principal of Jones College Prep, which draws high-performing students from across Chicago, has already been suspended over his handling of the incident, which he initially downplayed. The Chicago school district has launched an investigation into whether the school followed “protocols for processing bias-based harm.”

But students say the inciden...