He had his citizenship revoked, only restored posthumously in 1976, and was sentenced to ten years in prison for criticism of the Espionage Act of 1917 although he was released by Harding's order in 1921.  
He wrote the book Walls and Bars, a critique of prisons, partly from his own experience in one.  He had his citizenship revoked, only restored posthumously in 1976, and was sentenced to ten years in prison for criticism of the Espionage Act of 1917 although he was released by Harding's order in 1921.  A native of Terre Haute, he was earlier unsuccessfully defended by Clarence Darrow for his leadership in the Pullman Strike.  He may be most notable, however, for running as a third party candidate in the presidential elections of 1900, 1904, 1908, 1912, and 1920.  FTP identify this longtime Socialist Party leader.
He wrote the book Walls and Bars, a critique of prisons, partly from his own experience in one.  
Eugene Debs