Hello, Ernest (1828–1885)

Bernstein, Eduard (1850–1932)

Moszczeńska, Izabela (1864–1941)

Appel, Karol (1857–1930)

Bogdanov, Aleksandr Aleksandrovič (1873–1928)

Buisson, Ferdinand (1841–1932) Renard, Georges Francis (1847–1930) Séailles, Gabriel (1852–1923)

Kautsky, Karl (1854–1938)

Posner, Stanisław (1868–1930)

Lafargue, Paul (1842–1911)

Kelles-Krauz, Kazimierz (1872–1905)

Marchlewski, Julian (1866–1925)

Janowicz, Ludwik (1858–1902)

Perl, Feliks (1871–1927)

Beck, Adolf (1863–1942)

Dybowski, Benedykt (1833–1930)

Garfein-Garski, Stanisław (1867–1928)

Bouglé, Célestin Charles Alfred (1870–1940)

Jevons, William Stanley (1835–1882)

Biegański, Władysław (1857–1917)

Bebel, August (1840–1913)

Lafargue, Paul (1842–1911)

Greulich, Hermann (1842–1925)

Jodl, Friedrich (1849–1914)

Kelles-Krauz, Kazimierz (1872–1905)