- Kautsky, Karl Johann, 1854-1938 (2)
- Fröhlich, Friedrich Wilhelm, 1879-1932 (1)
- Goltz, Theodor Alexander Ludwig Georg, Freiherr von der, 1836-1905 (1)
- Hillquit, Morris, 1869-1933 (1)
- Lafargue, Paul, 1842-1911 (1)
- Lehmann, Ernst, 1880- (1)
- Liefmann, Robert, 1874-1941 (1)
- Lindemann, Carl Hugo, 1867- (1)
- Michaelis, Leonor, 1875-1949 (1)
- Seelhorst, C. von (1)
- Verworn, Max, 1863-1921 (1)
- Wiegand, Julius, 1880- (1)
- no value (4)