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He received support from Séverine, the Countess of Noailles, Albert Einstein, Edmond Fleg, Maxim Gorky, Paul Langevin, Victor Basch and Henry Torrès, Schwartzbard's lawyer.
Other personalities to offer support were Professor Langevin, the Joliot-Curies, André Malraux, etc.
He belonged to a group of friends and scientists that notably included Pierre and Marie Curie, Paul Langevin, Jean Perrin, and the mathematician Émile Borel.
Maier-Leibnitz was instrumental, along with Louis Néel, in bringing about the German-French project to construct a high-flux neutron source and found the Institut Laue-Langevin in Grenoble in 1967, named in honor of the physicist Max von Laue and Paul Langevin.
In 1919 he obtained a scholarship to continue his studies in Paris, attending courses of famous scientists, such as Gabriel Lippmann, Marie Curie, Paul Langevin, Aimé Cotton.
The trial attracted Soviet propaganda and international attention, with Romain Rolland, Maxim Gorky, Paul Langevin, Theodore Dreiser, and Albert Einstein, among others, speaking out on behalf of the defendants, while Henri Barbusse even traveled to Romania to witness the proceedings.