Fagnot, François (1866–1939)
Biegański, Władysław (1857–1917)
Kautsky, Karl (1854–1938)
Kautsky, Karl (1854–1938)
Miklaševskij, Aleksandr Nikolaevič (1864–1911)
Twardowski, Kazimierz (1866–1938)
Høffding, Harald (1843–1931)
Garfein-Garski, Stanisław (1867–1928)
Ciembroniewicz, Józef (1877–1929) Szyc, Aniela (1869–1921)
Lunačarskij, Anatolij Vasil'evič (1875–1933)
Jaurès, Jean (1859–1914) Lafargue, Paul (1842–1911)