Jaime Semprún was then at the origin of the creation of the Post-Situationist group and journal Encyclopédie des Nuisances, of which he was the main actor.
Jaime Semprún gave a lot of his time, along with Anne Krief (his partner) and Michel Pétris, to the translation and publication of the writings of George Orwell unpublished in France at the time for the éditions Ivrea coedited with the éditions de l'Encyclopédie des Nuisances, a work he started, according to Christophe Bourseiller, « under the auspices » of Guy Debord and Gérard Lebovici.
[4] In his book Défense et illustration de la novlangue française published in 2005, Jaime Semprún analysed the transformation of the French language at the time of the omnipresence of technology and computers.
In 2008, 40 years after May 68, Semprún published Catastrophisme, administration du désastre et soumission durable, written with René Riesel, in which he developed his critique of contemporary industrial society, including different leftist, activist movements, advocates of curtailing economic growth and state environmentalism.
[5] In January 2011, the Éditions de l'Encyclopédie des Nuisances published a posthumous essay of his, Andromaque, je pense à vous !.