Oneal was born March 13, 1875, in
Indianapolis, Indiana, the son of an iron worker. Upon the death of his father, Oneal was forced to leave school to go to work in a steel mill to help support his family. Oneal attended public school only to the 6th grade, relying instead upon self-education. Oneal was an early convert to
social democratic politics, joining the
Socialist Labor Party of America in 1895 before leaving to join the Chicago-based
Social Democratic Party of America (SDP) of
Victor L. Berger and
Eugene V. Debs shortly after its founding in 1897. Long a resident of
Terre Haute, Indiana, Oneal was a close personal friend of his neighbor Debs. Oneal was a delegate to the 1900 convention of the SDP and to the
1901 Unity Convention at which the
Socialist Party of America (SPA) was born. He was also elected as the first State Secretary of the Socialist Party of Indiana, state affiliate of the SPA, shortly after establishment of the new party. The following year Oneal was elected to the governing National Committee of the SPA as the representative of the Socialist Party of Indiana. In 1903, Oneal moved to
Omaha and went to work in the party's National Office as an assistant to Executive Secretary
William Mailly. He continued in that role until 1905, at which time he left to become the Associate Editor of the New York
Worker, forerunner of the great Socialist daily, the
New York Call. After leaving the Worker in 1908, Oneal returned home to
Indiana, where he was elected the State Secretary of the SP of Indiana from 1911 to 1913. By 1915, Oneal had relocated again, this time to
Massachusetts, where he was elected State Secretary of that party in 1915, continuing in that post until 1917. Oneal attended virtually every convention of the SPA as a delegate, including the seminal Emergency National Conventions of
1917, as a delegate from Massachusetts, and
1919, as a delegate from New York. Oneal also ran for office on the Socialist ticket, standing for President of the Brooklyn Board of Aldermen in 1919. Oneal's main occupation in these years was that of Socialist journalist. From 1918 until the end of the publication in 1923, Oneal was the editorial writer for the SPA daily, the
New York Call. In that role he was extremely influential during the factional party turmoil which erupted in 1919, a power made even more forceful when combined with the voice and vote which Oneal held on the party's governing 15 member National Executive Committee, to which he was elected in 1918. After the demise of the daily
Call, Oneal was instrumental in starting its weekly successor,
The New Leader, and he served as editor of that long-running publication from its establishment in 1924. ==1919 controversy==