Karl Kautsky lived in Berlin-Friedenau for many years; his wife, Luise Kautsky, became a close friend of Rosa Luxemburg, who also lived in Friedenau.
Karl Kautsky Berlin-Friedenau-ban élt sok éven át, felesége Luise Kautsky, a szintén Friedenauban lakó Rosa Luxemburg közeli barátja volt.