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Even Karl Liebknecht , who became one of the most outspoken opponents of the war , initially followed the line of the party that his father , Wilhelm Liebknecht , had cofounded : he abstained from voting and did not defy his own political colleagues .
 Karl Liebknecht, Wilhelm Liebknecht
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Karl Liebknecht, Wilhelm Liebknecht