Greeman is best known for his studies and translations of the Franco-Russian novelist and revolutionary Victor Serge (1890–1947).
Protests came from intellectuals of various political ideologies, including Georges Duhamel, Charles Vildrac, Boris Souvarine, André Gide and Romain Rolland.
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Pierre Laval, the French prime minister, refused to grant Serge an entry permit, but Emile Vandervelde, a veteran socialist who by then was a member of the Belgian government, managed to obtain Serge a visa to live in Belgium.
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In 1905, Libertad founded what was probably the most important individualist anarchist journal, L’Anarchie, which included among its collaborators André Lorulot, Emile Armand, and Victor Serge and his companion Rirette Maitrejean.
During 1963-64, Greeman returned to Paris with a French Government scholarship, took courses at the Sorbonne, began his research on the life and works of Victor Serge (1890–1947) whom he admired both as a novelist, a revolutionary witness, and a libertarian socialist thinker.