The references in Breeding Ground to the OSS are based on fact. William Fairbairn, “the Shanghai Buster” was, indeed, OSS’s legendary hand-to-hand combat instructor, and among his many other contributions, he did teach a method for folding a newspaper into a lethal weapon.
The Aunt Jemima and Casey Jones explosive devices were invented by OSS’s R&D team, and were used to destroy trains and other transport behind-the-lines in enemy occupied territories during WWII. There were many other gadgets invented in the OSS labs – several less practical; a few quite amusing.
The depictions of the factions within the French Resistance are based on fact, and the tensions between them did substantially compromise the functioning of the underground, and complicate politics all across France after the war.
For those interested in reading more about the OSS and the French Resistance, I can recommend:
Operatives, Spies And Saboteurs: The Unknown Story of the Men and Women of WWII’s OSS by Patrick K. O’Donnell
Is Paris Burning? by Larry Collins and Dominique Lapierre
Wild Bill Donovan: The Spymaster Who Created The OSS and Modern American Espionage by Douglas Waller
France: The Dark Years 1940-1944 by Julian Jackson
An American Heroine In The French Resistance: The Diary and Memoir of Virginia D’Albert-Lake, edited with an introduction by Judy Barrett Litoff
Carve Her Name With Pride: The Story of Violette Szabo by R.J. Minney
There are many other excellent books that examine the OSS and the French Resistance. The ones I’ve mentioned barely suggest a place to start.