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- Industrial Union Party (U.S.)1
- Lenin, Vladimir Ilʹich, 1870-19241
- Lozovskiĭ, A., 1878-19521
- Luxemburg, Rosa, 1871-19191
- Manheim, Ralph, 1907-19921
- Serge, Victor, 1890-19471
- Trotsky, Leon, 1879-19401
- Wolfe, Bertram David, 1896-19771