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The action attracted a strong public and international response on December 31 , 2009 , when among dozens of other participants the police grabbed and detained the Chairperson of the Moscow Helsinki Group Lyudmila Alexeyeva ( 84 ) .
 Moscow Helsinki Group Lyudmila Alexeyeva
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Moscow Helsinki Group Lyudmila Alexeyeva