In the Cities in Flight science fiction novels, the US develops the spindizzy, a faster-than-light drive that relies upon an obscure (and, unfortunately, nonexistent) connection between electromagnetic and gravitational forces. The drive had the nice property of working more and more efficiently for larger masses, which led to it eventually being applied to whole cities: New York, zooming through the Galaxy at warp 9.
As the story goes, the spindizzy is developed in the US in 2018, and some people (without government permission) use it to leave an increasingly-totalitarian society and settle habitable planets in the stars around Sol. Shortly thereafter, a totalitarian government takes over the entire Earth (The Bureaucratic State) and immediately bans spindizzies, because they make escape all too easy.
In 2375, the spindizzy was independently rediscovered on Earth. This must have happened because the ARM cops did a bad job. You can make knowledge so forbidden that fewer and fewer censors actually understand what they’re trying to suppress – which must eventually lead to failure.
In much the same way, we have arrived at the point where the typical young informaticist working in human genetics does not even know that there are between-group intelligence differences that his results might explain. So he publishes – and nobody stops him, because even the referees don’t know. Marcus Feldman and his flying squads would never have made such a mistake.
I used to think that knowing more was the only path to progress, but that ain’t necessarily so. When ignorance is Blish, ’tis folly to be wise.