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Following the February Revolution he became the main organizer of the RSDLP ( b ) in the Zamoskvoretskogo district and a member of the Moscow Committee of the party .
 RSDLP ( b ), Moscow
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 RSDLP ( b ), Moscow