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Friedeberg contributed to Sozialistischer Akademiker from early 1895 to the end of 1896 and from 1897 on he was a member of the press commission of Sozialistische Monatshefte , both periodicals , which attempted to draw intellectuals to socialism and the Social Democratic Party of Germany ( SPD ) .
 Friedeberg, Social Democratic Party of Germany
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Friedeberg, Social Democratic Party of Germany