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Gerhard Hildebrand ( born 1877 ) , was a German journalist and from 1903 on member of the Social Democratic Party .
 Gerhard Hildebrand, Social Democratic Party
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gerhard Hildebrand, Social Democratic Party