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- Lenin, Vladimir Ilʹich, 1870-192413
- Trotsky, Leon, 1879-194011
- League for Industrial Democracy5
- Bradford H. Gray Collection in the History of Social Thought (Beinecke Rare Book and Manuscript Library)4
- Engels, Friedrich, 1820-18954
- Laidler, Harry W. (Harry Wellington), 1884-19703
- Manheim, Ralph, 1907-19923
- Marx, Karl, 1818-18833
- Serge, Victor, 1890-19473
- Shachtman, Max, 1903-19723
- Aveling, Eleanor Marx, 1855-18982
- Calverton, V. F. (Victor Francis), 1900-19402
- De Leon, Daniel, 1852-19142
- Industrial Union Party (U.S.)2
- Josephson, Matthew, 1899-19782
- Lafargue, Paul, 1842-19112
- Nearing, Scott, 1883-19832
- Simons, A. M. (Algie Martin), 1870-19502
- Socialist Workers Party2
- Strachey, John, 1901-19632