During this time, Isidor sold an invention and dreamt that his dead wife willed the children to have a European education, so he sent them to Vienna with the newfound windfall.

[4] Endore's first novel was The Man From Limbo (1930), about an impoverished college graduate obsessed with acquiring wealth; it was influenced by Robert Louis Stevenson.

Despite his eventual blacklisting, Endore had a fairly successful career in Hollywood, working on scripts or story ideas for big name pictures of the time.

[citation needed] Throughout his career Endore showed himself to be fascinated with hypnotism and the inability of characters to control their own actions, centering his stories on supernatural maladies such as lycanthropy and hypnosis.

Mad Love, Peter Lorre’s American debut, an adaptation of Maurice Renard's novel Les Mains d'Orlac, involves a man who, after an accident, is fitted with the hands of a murderer which try to continue in their gruesome career.

Endore began his movie writing career in 1935, when he wrote the story for Rumba, a star vehicle for George Raft and Carole Lombard, which was given a scathing review in The New York Times.

While he attended Columbia, he was drawn to the political left by Whittaker Chambers, then a communist who was a fellow student, and by the harsh Great Depression world in which he lived.

While he lived in Hollywood, Endore was interviewed several times and wrote articles for multiple leftist publications, including Black and White, The New York Clipper and New Masses.

After the release of Khrushchev's Secret Speech (1956) which confirmed the reality of Stalin's abuses, Endore abandoned the fight against the blacklist only a few years before the reinstatement of many leftist sympathizers in the film industry, which has cast him into obscurity among the more prominent pro-Communist writers.

As Joseph Ramsey summarizes, he "called for 'a new school of Marxian historical fiction,' to be based in 'a study of original sources' so as 'to furnish reliable and powerful revolutionary weapons.

'"[7] Endore struggled, however, to produce significant works of leftist fiction and he often felt resigned to composing what he believed would sell, especially after the public failure of his anti-slavery novel Babouk, with its more explicitly sympathetic depiction of the Haitian Revolution.

In the "About the Author" section that concludes the 1941 Pocket Books edition of The Werewolf of Paris Endore describes himself as "to a large extent a vegetarian, a teetotaler, a non-smoker.

"[8] Although more famous for his fiction, Endore was a committed activist, attempting to protect with words those who were mistreated by the American culture and legal system and using literature to illuminate what he considered to be historical oversights.

In 1942 Endore involved himself deeply in the defense of those arrested in the "Sleepy Lagoon" case (also known as the "Chicano Scottsboro"), when seventeen Mexican teenagers were incarcerated for a murder.

Although there was scant evidence, a complete lack of eyewitnesses and no murder weapon to be found, they were put away in a wave of hysteria spread through the newspapers of LA.