The Jungle

An employee at Macmillan wrote,

I advise without hesitation and unreservedly against the publication of this book[ The Jungle, by Upton Sinclair] which is gloom and horror unrelieved. One feels that what is at the bottom of his fierceness is not nearly so much desire to help the poor as hatred of the rich.[5]

In 1933, the book became a target of the Nazi book burnings due to Sinclair's endorsement of socialism.[13]
-Wikipedia