- Abramowski, Edward, 1868-1918 (1)
- Bellamy, Richard (Richard Paul) (1)
- Bobbio, Norberto, 1909- (1)
- Bogdanov, A. (Aleksandr), 1873-1928 (1)
- Bukharin, N. I. (Nikolaĭ Ivanovich), 1888-1938 (1)
- Chernov, V. M. (Viktor Mikhaĭlovich), 1873-1952 (1)
- Coe, Richard D. (1)
- Ghosha, Śivadāsa, 1892-1976 (1)
- Griffin, Roger (1)
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- Kalbarczyk, Damian (1)
- Naumenko, L. K. (1)
- Paquot, Thierry (1)
- Schumpeter, Joseph Alois, 1883-1950 (1)
- Smirnov, G. L. (Georgiĭ Lukich) (1)
- Socialist Unity Centre of India (1)
- Sorel, Georges, 1847-1922 (1)
- Swedberg, Richard (1)
- Wilber, Charles K. (1)