Representatives of Amazon.com Inc. workers in Germany will take their beef with the e-commerce giant to the U.S. Monday, staging a protest at the retailer's Seattle headquarters in tandem with strikes planned at Amazon sites in Germany.

This is the first time the union has taken a German wage dispute outside the country to a corporation's doorstep, Mechthild Middeke of the services union Ver.di said. At the same time, she stressed the U.S. action is symbolic.

"What's happening in Seattle is not a strike, but an act of solidarity with workers in Germany," Ms. Middeke said. A number of U.S. unions will take part in the protest, including the Teamsters and the Service Employees International Union, two of the largest U.S. unions.

Ver.di has been embroiled in a dispute with Amazon on wages and working conditions for over a year, resulting in a series of strikes that started this spring. At the time of the last strike in late November, Ver.di left open the possibility of further industrial action during the holiday shopping season as a way to get Amazon's attention.

At issue are industrywide wage agreements that Ver.di wants Amazon to implement instead of using its own pay scale. Ver.di also wants Amazon's Germany-based employees to be paid in line with the retail and mail-order sector, which offers a higher entry-level wage than the logistics sector, where Amazon classifies most of its employees.

"Employees at Amazon deliver excellent work every day, and for that they rightfully demand the assurance and protection of retail and mail-order sector wage agreements, as well as healthy working conditions and respectful treatment," the union said in a statement.

Amazon could not be reached for comment immediately. The company has previously defended its wage policies, saying employees earn toward the upper end of the pay scale of logistics companies in Germany. Amazon has also said it prefers to address employment issues with workers councils at individual sites rather than negotiating with the union.

On Monday, Ver.di expects 1,000 workers in Germany to participate in strikes at three locations, Ms. Middeke said, though it could be more. In Bad Hersfeld, where Amazon has two logistics centers, some 600 employees are expected, compared with 400 in Leipzig.

Amazon employs about 9,000 people at nine logistics centers in Germany, the company's largest single market outside the U.S. In 2012, the online retailer generated $8.7 billion of its $61 billion in global revenue in Germany.

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