Lysenkoism

thumb|upright=1.35 |Trofim Lysenko speaking at the Kremlin in 1935; behind him are (left to right) [[Stanislav Kosior, Anastas Mikoyan, Andrei Andreev and Joseph Stalin]] Lysenkoism was a pseudoscientific political campaign led by the Soviet biologist Trofim Lysenko against genetics and science-based agriculture in the mid-20th century, rejecting natural selection in favour of a form of Lamarckism, as well as expanding upon the techniques of vernalization and grafting.

More than 3,000 mainstream biologists were dismissed or imprisoned, and numerous scientists were executed in the Soviet campaign to suppress scientific opponents. The president of the Soviet Agriculture Academy, Nikolai Vavilov, who had been Lysenko's mentor, but later denounced him, was sent to prison and died there, while Soviet genetics research was effectively destroyed. Research and teaching in the fields of neurophysiology, cell biology, and many other biological disciplines were harmed or banned.