Biography
Charles Schenck, general secretary of the Socialist Party in Philadelphia, was convicted under the Espionage Act of 1917 after distributing anti-draft leaflets during World War I. The Supreme Court affirmed the conviction in Schenck v. United States, 249 U.S. 47 (1919). A 2019 legal-history chapter reports that he served six months. Sources: https://tile.loc.gov/storage-services/service/ll/usrep/usrep249/usrep249047/usrep249047.pdf ; https://www.oyez.org/cases/1900-1940/249us47
Review of the 2019 SAGE legal-history chapter, corroborated against the Supreme Court report and Oyez. The chapter reports six months actually served; no admission or release day is inferred.
Schenck v. United States, 249 U.S. 47 (1919), Library of Congress