Elisée Reclus (1830-1905) was far ahead of his time in many fields: he was the first practitioner of the field of social geography, counts as one of the founders of naturism and vegetarianism, led the way at the Paris Commune (1870) and propagated the world language Esperanto.
Missratene Söhne. Anarchismus und Sprachkritik im Fin de Siècle by Carolin Kosuch is a triple-biography of three befriended Jewish 'rebels' around the turn of the century, Gustav Landauer, Erich Mühsam and Fritz Mauthner.
Gustav Landauer (1870-1919) is known in a small circle as anarchist theorist, writer and translator of Shakespeare. He was also minister of propaganda in the short-lived Bavarian Council Republic of 1919.