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Karl Wilhelm Berkhan ( April 8 , 1915 in Hamburg – March 9 , 1994 in Hamburg ) , also known as Willi Berkhan , was a German politician , representative of the Social Democratic Party .
 Karl Wilhelm Berkhan, Hamburg, Hamburg, Berkhan, German, 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:
 Karl Wilhelm Berkhan, Hamburg, Hamburg, Berkhan, German, Social Democratic Party