Błażejewicz, Tadeusz
Dybowski, Benedykt (1833–1930)
Gall, Stanisław (1865–1942) Tauer, Antoni (1873–1910)
Høffding, Harald (1843–1931)
Buisson, Ferdinand (1841–1932)
Jaurès, Jean (1859–1914) Lafargue, Paul (1842–1911)
Høffding, Harald (1843–1931)
Kovalevskij, Maksim Maksimovič (1851–1916)
Adamski, Józef Stanisław (1854–1926)
Sterling, Władysław (c. 1876 – c. 1943)