In the foreword to I Saw It Happen, a 1942 collection of eye-witness accounts of the war, Lewis Gannett wrote: "... We shall be hearing and reading of this war for decades to come. No one of us can yet guess who will be its Tolstoys, its Barbusses, its Remarques and its Hemingways".
Besides numerous French, Italian, Dutch, and (later) Ukrainian landscapes, he also painted flowers, still life, nudes, and portraits (such as of Oleksander Dovzhenko and Volodymyr Vynnychenko, as well as portraits commissioned by the Soviet government of the French writers Henri Barbusse, Romen Rolland, and Victor Margueritte and the painter Paul Signac).
Henri Matisse | Henri de la Tour d'Auvergne, Vicomte de Turenne | Bernard-Henri Lévy | Henri Dutilleux | Paul-Henri Mathieu | Henri Poincaré | Robert Henri | Henri Mignet | Henri Cartier-Bresson | Henri Fayol | Henri Bendel | Henri Barbusse | Jean-Henri Fabre | Henri-Pierre Roché | Henri Langlois | Henri, Grand Duke of Luxembourg | Henri Fantin-Latour | Paul-Henri Spaak | Jacques-Henri Bernardin de Saint-Pierre | Henri Wallon | Henri Vieuxtemps | Henri Vernes | Henri Salvador | Henri Pousseur | Henri Michaux | Henri Guillaumet | Henri Estienne | Lycée Henri-IV | Henri Tajfel | Henri Sauguet |
In 1930, an international petition on his behalf was sent to the Finnish defense minister Juho Niukkanen, which included the signatures of sixty British MPs and notables such as Albert Einstein, Henri Barbusse and H. G. Wells.
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.
Despite this association, or the Clarté universitaire group of Georges Cogniot, related to Paul Vaillant-Couturier and Henri Barbusse's Clarté movement, there was no stable Communist youth organisation before 1938.
The WIR was supported by numerous left intellectuals, among them Martin Andersen Nexö, Henri Barbusse, Maxim Gorki, George Grosz, Maximilian Harden, Arthur Holitscher, Käthe Kollwitz, George Bernard Shaw, Upton Sinclair and Ernst Toller.
::Volume I : Guillaume Apollinaire, Henri Barbusse, Henry Bataille, André Castagnou, Jean Cocteau, Tristan Corbière, Guy-Charles Cros, Lucie Delarue-Mardrus, Tristan Derème, Charles Derennes, Emile Despax, Léon Deubel, Alfred Droin, Georges Duhamel, Édouard Dujardin, Max Elskamp, Fagus, André Fontainas, Paul Fort, René Ghil, Remy de Gourmont, Fernand Gregh, Charles Guérin.