Biography
Work reports that a mob forced Foster into a flag parade in Lewistown, Montana, on March 27, 1918, after which authorities arrested him for sedition. The subsequent conviction brought a $500 fine. The source does not establish the physical discharge date or complete detention duration. Clemens P. Work, Darkest Before Dawn: Sedition and Free Speech in the American West, title page and chapter10 pp133–147, original PDF page 7. Source: https://mhs.mt.gov/education/WWI/WorkChap10.pdf#page=7
