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Back to Berlin he joined the German Democratic Party ( DDP ) in 1920 and in 1921 became district administrator ( Landrat ) at Rosenberg , Marienwerder ( today Susz , Poland ) .
 Berlin, German Democratic Party, Rosenberg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Berlin, German Democratic Party, Rosenberg