Beck, Adolf (1863–1942) Bikeles, Gustaw (1861–1918)
Łuczyński, Witold (1875– )
Raciborski, Aleksander (1845–1920)
Jaurès, Jean (1859–1914) Lafargue, Paul (1842–1911)
Libański, Edmund (1862–1928)
Brysz, Simon (1884– )
Hertwig, Oskar (1849–1922)
Trentowski, Bronisław (1808–1869)