Question: Alexander Goldfarb has been associated with a Russian nuclear physicist who is also an activist for what causes?
Sentence (from "Alexander Goldfarb (biologist)"): He has combined a scientific career as a microbiologist with political and public activities focused on civil liberties and human rights in Russia, in the course of which he has been associated with Andrei Sakharov, George Soros, Boris Berezovsky, and Alexander Litvinenko.
Relevant evidence: Yes