 Nadezhda Tolokonnikova and Maria Alyokhina participated in the February 6 , 2014 Amnesty International concert in Barclays Center , Brooklyn , New York City . They were invited to the stage by Madonna . The same day a group of anonymous participants of the Pussy Riot group who avoided prosecution for their performance published an open letter protesting Tolokonnikova and Alyokhina calling themselves members of Pussy Riot . The letter claimed that : 
