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Sack was born to a Jewish family in New York City. His work appeared in such periodicals as Harper's, The Atlantic, Esquire and The New Yorker. He was a war correspondent in Korea, Vietnam, Iraq, Afghanistan and the former Yugoslavia.
A correspondent and later a bureau chief for CBS News in Spain, he authored ten books, including the controversial title, An Eye for an Eye: The Untold Story of Jewish Revenge Against Germans in 1945, which described cases of persecution of Germans by Jews in post-World-War II Polish internment camps. 
He died on March 27, 2004, three days after his 74th birthday, from prostate cancer in San Francisco, California, according to his New York Times obituary. He was survived by a sister, Lois Edelstein.
- 1952: The Butcher: The Ascent of Yerupaja New York: Rinehart & Co. Library of Congress Catalog Card Number 52-7159
- 1959: Report from Practically Nowhere OCLC 1321371
- 1971: Lieutenant Calley: his own story; [as told to] John Sack. New York: Viking Press. ISBN 0670428213
- 1982: Fingerprint. New York: Random House ISBN 0-394-50197-7
- 1985: M. New York: Avon Books. ISBN 0380698668 Reissued in 1986 by Corgi Children's.
- 1993: An Eye for an Eye. New York, NY: BasicBooks (about Lola Potok Ackerfeld Blatt) ISBN 0465022154
- 1995: Company C: the real war in Iraq. New York: William Morrow; ISBN 0-688-11281-1
- Blog of Death: John Sack entry; April 02, 2004 at the Wayback Machine (archived June 8, 2004) by Jade Walker.
-  The New York Times, "John Sack, 74, Correspondent Who Reported From Battlefields", 31 March 2004]
- An Eye for An Eye: The Story of Jews Who Sought Revenge for the Holocaust. Sack, John. (ISBN 978-0967569109)
- Works by or about John Sack in libraries (WorldCat catalog)
- "John Sack, 74, Correspondent Who Reported From Battlefields" by Christopher Lehmann-Haupt, The New York Times, March 31, 2004
- Obituary in Esquire
- 1966 Esquire article "M", aka "Oh my God — we hit a little girl."
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