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- Trotsky, Leon, 1879-194016
- Lenin, Vladimir Ilʹich, 1870-192415
- Engels, Friedrich, 1820-18955
- Headlam, James Wycliffe, 1863-19295
- League for Industrial Democracy5
- Lloyd George, David, 1863-19455
- Shachtman, Max, 1903-19725
- Bradford H. Gray Collection in the History of Social Thought (Beinecke Rare Book and Manuscript Library)4
- Erber, Ernest4
- Grey of Fallodon, Edward Grey, Viscount, 1862-19334
- Mercier, Désiré, 1851-19264
- Robertson, J. M. (John Mackinnon), 1856-19334
- Archer, William, 1856-19243
- Bryce, James Bryce, Viscount, 1838-19223
- Hurd, Archibald, 1869-19593
- Independent Socialist League3
- Josephson, Matthew, 1899-19783
- Laidler, Harry W. (Harry Wellington), 1884-19703
- Lanka Sama Samaja Party3
- Manheim, Ralph, 1907-19923