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Sergei Adamovich Kovalyov (also spelled Sergey Kovalev; Russian: Сергей Адамович Ковалёв; 2 March 1930 - 9 August 2021) was a Russian human rights activist and politician. During the Soviet period he was a dissident and, after 1975, a political prisoner.

Sergei Kovalev Krassotkin. Sergei Kovalev, one of the most significant political and human rights figures of the Soviet Union and Russia, died Monday. He was 91 years old. Sergei Kovalev was born

Like many in the Soviet dissident movement, Kovalev joined the human rights struggle from the academic world. A successful biophysicist and head of a laboratory section at Moscow State University