Wisconsin Gov. Scott Walker spoke about taking on public employee unions, and the protests that followed, at a recent candidates forum in Iowa. He said what people may not know is that protesters — as many as 1,000 of them — showed up outside his home while his family was there. He says he also received death threats. Scott Olson/Getty Images hide caption

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Market Basket meat manager Bob Dietz of Methuen, Mass., (center) and other workers celebrate after watching a televised speech last month by restored Market Basket CEO Arthur T. Demoulas at a store in Chelsea. Steven Senne/AP hide caption

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Nancy Becker, an Amazon employee in Bad Hersfeld, Germany, speaks at a protest rally outside the company's headquarters in Seattle in December. Ted S. Warren/AP hide caption

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Members of the California Nurses Association say they rallied in Sacramento in May to raise public awareness of their concerns about patient care in California hospitals. April Dembosky/KQED hide caption

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Picketers supporting independent truck drivers at the ports of Los Angeles and Long Beach stand outside a container terminal. Kirk Siegler/NPR hide caption

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Shabazz Napier of the Connecticut Huskies speaks to the media in the locker room after defeating Kentucky in the NCAA men's championship on April 7. Jamie Squire/Getty Images hide caption

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The Paris Sephora store, seen here on a night last fall night on the Champs-Elysees, must close at 9 p.m., a high court has ruled. The cosmetics chain had required workers to keep the store open until midnight. Kenzo Tribouillard/AFP/Getty Images hide caption

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Volkswagen's car plant in Chattanooga, Tenn., is the company's only one in the U.S. Its employees voted this week on whether to join the United Auto Workers union. Volkswagen hide caption

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An Amazon.com employee stocks products along one of the many miles of aisles at an Amazon.com Fulfillment Center in Phoenix last month. Ross D. Franklin/AP hide caption

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In November 2004, the Grand Ole Opry came to Carnegie Hall. Paul Hawthorne/Getty Images hide caption

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Frustrated commuters wait at the Transbay Temporary Terminal in San Francisco to catch a bus over to Oakland on Tuesday. Alan Greenblatt/NPR hide caption

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The Fruitvale BART station is closed Monday due to a strike in Oakland, Calif. Negotiations between unions and management broke off late Sunday despite the request of California Gov. Jerry Brown in a last-ditch effort to reach a deal. Ben Margot/AP hide caption

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A group that advocates on behalf of food service workers has created an app that helps diners find restaurants that pay their workers livable wages and offer room for advancement. iStockphoto.com hide caption

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