Government officials are trying to avoid a repeat of last weekend’s unrest across the country, which injured police officers and damaged stores.

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The tax initiative is the most ambitious proposal that Dave Regan has ever qualified for the California ballot. Some Democrats hope it will be his final one.

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The United Auto Workers has grown under Mr. Fain, who has also drawn scrutiny from federal prosecutors.

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Union members, parents, teachers and others took part in mass demonstrations around the country, backing student demands that the government invest more in schools.

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