Sergei Kovalyov, one of the most prominent and eloquent Soviet and Russian human rights activists, died in his sleep in Moscow on August 9, his son Ivan wrote on social media. He was 91.
RFE/RL: Sergei Kovalyov, heir to Sakharov dies at 91
Russian human rights advocates and dissidents Sergei Kovalyov (L) and Lyudmila Alexeyeva confer before watching a documentary on "Torture Cases in a pre-trial prison in the Siberian city of Irkutsk' during the film presentation in Moscow on Feb. 21, 2011.
