Employees at Amazon sites in Leipzig and Bad Hersfeld staged walkouts today, calling for Amazon to align its pay with that normally paid in Germany's retail and mail-order sectors.
And for the first time, a site in Graben in Bavaria also joined the movement.
A spokesman for Germany's service sector union Verdi said 600 workers -- out of 3,300 -- had walked off the job in Bad Hersfeld, the biggest Amazon hub in Germany with more action expected tomorrow and Wednesday.
In Graben, about 350 strikers staged walkouts with more expected to join, Verdi said.
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Verdi has been trying for months to bring the pay of Amazon's 9,000 workers in Germany in line with wages in the distribution sector.
Amazon refuses, arguing that its distribution centres are logistics sites and that it pays its staff accordingly. Wages in the logistics sector in Germany are lower than in the distribution sector.
Germany is Amazon's biggest market outside the United Sates, but months of strike action, as well as a scathing TV documentary broadcast earlier this year, have tarnished the company's image.
As problems accumulate in Germany, in October Amazon said it planned to open two distribution centres in the Czech Republic by the end of 2014.
The centres are a response to increased demand across Europe, Amazon said at the time, adding that it chose the Czech Republic for its prime location in the heart of Europe.