He was imprisoned at the Federal Military Prison on Alcatraz Island, having refused the draft during the first World War. By the end of 1920, two years after the war ended, he was the only remaining conscientious objector at Alcatraz, and in poor health, at least partly due to inhumane treatment there.
Grosser is notable for writing one of the first exposés of Alcatraz Prison, the 32-page pamphlet Uncle Sam's Devil's Island, which told of his experience in the prison.
- Grosser, Philip (2007). Alcatraz - Uncle Sam's Devil's Island: Experiences of a Conscientious Objector in America during the First World War. London: Kate Sharpley Library. ISBN 1-873605-24-2.
- "GROSSER, Philip. 'Alcatraz' Uncle Sam's Devil's Island : Experiences of a (...) - R.A. Forum". 2016-03-03. Archived from the original on 2016-03-03. Retrieved 2018-04-23.
- "Philip Grosser Held Example of Baker Spite". The Minneapolis Star. Minneapolis, Minnesota. Federated Press. 1920-11-05. Retrieved 2018-04-23 – via Newspapers.com .
- "Socialist Delegation Calls on Secretary". The San Bernardino County Sun. San Bernardino, California. Associated Press. 1920-05-20. Retrieved 2018-04-23 – via Newspapers.com .
- Beffel, John Nicholas (1920-05-14). "U. S. Still Uses Torture Cages at Alcatraz Jail". The Butte Daily Bulletin. Butte, Montana. Federated Press. Retrieved 2018-04-23 – via Newspapers.com .
- "Kate Sharpley Library". www.katesharpleylibrary.net. Retrieved 2018-04-26.
- Kohn, Stephen Martin (1994). American Political Prisoners: Prosecutions Under the Espionage and Sedition Acts. Greenwood Publishing Group. ISBN 9780275944155.
- Reedy's Mirror. 1920.
- Zimmer, Kenyon (2015-06-30). Immigrants against the State: Yiddish and Italian Anarchism in America. University of Illinois Press. ISBN 9780252097430.
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