This is a selectively annotated list of the most prominent or important members of the Socialist Party of America (1901–1972). Summary list Key: * Went on to join the Communist Party, Communist Labor Party of America or Workers Party of America ISS A founder or key member of the Intercollegiate Socialist Society, 1905, later League for Industrial Democracy IWW A founder of the Industrial Workers of the World, 1905. SDL Left to found the Social Democratic League of America, 1917. SDF Left to found the Social Democratic Federation, 1936. IPN Left to found the Independent Party of Norwalk, 1951 SDUSA Continued into Social Democrats, USA, 1973 SPUSA Went on to join the Socialist Party USA, 1973 DSOC Went on to join the Democratic Socialist Organizing Committee, 1973, later Democratic Socialists of America Martin Abern * Devere Allen Elmer Allison * Harry Ault J. Mahlon Barnes David P. Berenberg Victor L. Berger Barney Berlyn Allan L. Benson Ella Reeve Bloor * Nikolai Bukharin Roy E. Burt Frank Bohn IWW Earl Browder* Jack Carney * James P. Cannon * John C. Chase Travers Clement Joseph Coldwell James Connolly Eugene V. Debs IWW Nicholas Dozenberg * David Dubinsky Max Eastman * J. Louis Engdahl Elizabeth Gurley Flynn * William Z. Foster * Louis Fraina * Joseph Freeman * Irving Freese IPN Samuel Friedman SPUSA Julius Gerber Adolph Germer Arturo Giovannitti Benjamin Gitlow * Carl Haessler * Emanuel Haldeman-Julius SDL Job Harriman Michael Harrington DSOC Hubert Harrison Max S. Hayes Bill Haywood IWW Emil Herman George D. Herron Morris Hillquit ISS Daniel Hoan Darlington Hoopes SPUSA Jessie Wallace Hughan ISS Haim Kantorovitch David Karsner Helen Keller Charles H. Kerr George R. Kirkpatrick Alexandra Kollontai Antoinette Konikow * Frederick Krafft Maynard C. Krueger William F. Kruse * Leo Krzycki Harry W. Laidler ISS Algernon Lee ISS, SDF Lena Morrow Lewis SDF Walter Lippman Jack London ISS George Lunn Theresa S. Malkiel Mary Marcy James H. Maurer SDF Jasper McLevy SDF David McReynolds SPUSA Walter Thomas Mills Tom Mooney Thomas J. Morgan Gustavus Myers Scott Nearing Reinhold Niebuhr Santeri Nuorteva Kate Richards O'Hare James Oneal SDF Mary White Ovington Joseph Arthur Padway Jacob Panken Patrick L. Quinlan A. Philip Randolph SDF, SDUSA John Reed * Victor Reuther DSOC Walter Reuther Charles Edward Russell Bayard Rustin SDUSA Carl Sandburg Margaret Sanger Roland D. Sawyer Clarence Senior Max Shachtman Abraham Shiplacoff Upton Sinclair ISS John W. Slayton John