Which chapter implied or revealed Marjane's parents' left-wing ideals despite their opposition against the Shah?

In the chapter called The Water Cell, an angry mob gathers in the street. They are shouting “Down with the King!” Marjane’s parents are a part of the mob. The police shoot at the mob and the mob throws stones at the police. At the end of every day, Marjane’s parents return from the demonstrations with aches and pains in their bodies.

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