Naudet, Paul (1859–1929)
Marchlewski, Julian (1866–1925)
Buisson, Ferdinand (1841–1932) Renard, Georges Francis (1847–1930) Séailles, Gabriel (1852–1923)
Koszutska, Ludwika (1869–1928)
Dunin, Karol (1850–1917)
Lafargue, Paul (1842–1911)
Kautsky, Karl (1854–1938)
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