Biography
Oscar Swanson was arrested in November 1917 in the roundup of IWW members in Omaha, Nebraska. After over eighteen months in local jails, all charges against him were dropped.
The March 1920 One Big Union Monthly prisoner roster provides a contemporaneous procedural account. The roster lists an Omaha federal conspiracy indictment dated September 21, 1918, and bail of $10,000. Source: https://www.marxists.org/history/usa/pubs/one-big-union-monthly/v02n03-mar-1920_One%20Big%20Union.pdf#page=20
Printed O. Swanson in Latchem’s Omaha roster: arrested November 13, 1917, indicted September 21, 1918, released December 13, 1918 on $1,000 bond. These are attributed individual endpoints, not a sentence length; release on bail is not dismissal.
The One Big Union Monthly, May 1920, vol. 2 no. 5, PDF page 55.