They included Bertolt Brecht, Kurt Tucholsky, Erich Kästner, Heinrich Mann and many others. Scientists such as Albert Einstein and Sigmund Freud were also included. In all, some 100 German and more than 40 foreign authors — such as Ernest Hemingway and Andre Gide — were considered un-German.

https://www.dw.com/en/when-books-were-burned-in-germany/a-43725960

And if you meant to "name one" writer murdered at Palmiry (specifically, but there were many other execution sites for the extermination of Polish elites), for example the Warsaw University professors Stefan Kopeć (biologist) and Kazimierz Zakrzewski (historian) who co-wrote the Polish Popular Encyclopedia, or the poet and publisher Stefan Napierski.

(By chance, Napierski had translated to Polish one of the German books that have been burned: All Quiet on the Western Front.)