detained opposition activist , calling for freedom of assembly , Moscow 被拘留的反對派活動家，呼籲集會自由，莫斯科

ANDREY SMIRNOV/AFP/Getty Images
Photos of the day, August 31, 2011 | News | National Post
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Article 31 of the Russian constitution , guarantees the right of assembly.俄羅斯憲法第31條 , 保障集會的權利。

(Reuters)
August 31, 2011 « Day in Photos http://blogs.voanews.com/photos/2011/08/31/august-31-2011/