History moment: When Marxism ruled instead of Darwinism

In "The KGB's long war against Rudolph Nureyev,"

The careers of Leonid Romankov and his twin sister Liuba, scientists whose interest in literature and art had stimulated Nureyev, were blighted because of their friendship with him.

Principal dancer Nureyev had defected to the West in 1961, so everyone associated with him was punished. Knd of like stuff that happens today in the West - as Ruloff notes - only it's not Marx but Darwin who is the idol.