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After the beginning of World War II , Roth was to spend each summer in Switzerland at the behest of the Swiss charity Pro Juventute , a group trying to protect Swiss-German children from the worst ravages of the war .
 Roth
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Roth