- Allan L. Benson
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- Upton Sinclair
- George O. Smith
- Gabriel Pierre Deville
- Upton Sinclair
- Hilaire Belloc
- Francis W. Hirst
- L. G. Chiozza Money
- Upton Sinclair
- Joseph Mather
- Henry Demarest Lloyd
- Charles R. Drysdale
- Louis Dembitz Brandeis
- R. H. Tawney
- Henri Pirenne
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- John Burroughs
- W. H. Mallock
- W. A. P. Martin
- William Starr Myers
- Charles Baron Clarke
- Jack London
- Friedrich Engels
- Edward Bellamy
- Frank Norris
- Samuel Vaknin
- Upton Sinclair
- George Gissing
- G. K. Chesterton
- Upton Sinclair