" The totalitarian regimes of the 20th century give us the starkest examples of such insanity. Stalin persecuted genetics researchers in the 1930s and ostentatiously praised the scientist Trofim Lysenko when he claimed that genetics was a “bourgeois perversion” and geneticists were “saboteurs”. The resulting crop failures killed millions. For an encore, Stalin ordered the killing of the statistician in charge of the 1937 census, Olimpiy Kvitkin. Kvitkin’s crime was that his census revealed a fall in population as a result of that famine. Telling that truth could not be forgiven.

In May, the great crop scientist Yuan Longping died at the age of 90. He led the research effort to develop the hybrid rice crops that now feed billions of people. Yet in 1966, he too came very close to being killed as a counter-revolutionary during China’s cultural revolution.

In western democracies we do things differently. Governments do not execute scientists; they sideline them. Late last year, Undark magazine interviewed eight former US government scientists who had left their posts in frustration or protest at the obstacles placed in their way under the presidency of Donald Trump.

Then there are the random acts of hostility on the street and the death threats on social media. I have seen Twitter posts demanding that certain statisticians be silenced or hunted down and destroyed, sometimes for doing no more than publishing graphs of Covid-19 cases and hospitalisations. Even when this remains at the level of ugly intimidation, it is horrible to hear about and must be far worse to experience. It is not something we should expect a civil servant, a vaccine researcher or a journalist to have to endure. And it would be complacent to believe that the threats are always empty. "

― Tim Harford