20,000 Leagues Under the Sea

Twenty Thousand Leagues Under the Sea by Jules Verne is not a book that has been widely banned. However, the book's publisher, Pierre-Jules Hetzel, did make some revisions to the book before its publication to avoid offending the Russian Empire, a major French ally at the time.
Here's some more information about the book and its publisher:
Political motivations
In early drafts of the book, Captain Nemo was a Polish noble who sought revenge for his family's murder during Russia's suppression of the January Uprising. Hetzel insisted that Verne change Nemo's background and political motivations to avoid offending the Russian Empire.
Diplomatic relations
Hetzel was concerned that publishing the book could complicate diplomatic relations between France and Russia. France was looking for ways to get closer to Russia, while Russia's emperor Alexander II had remained neutral during Napoleon III's wars.

20,000 Leagues Under the Sea by Jules Verne. Twenty Thousand Leagues Under the Sea is a classic science fiction novel by French writer Jules Verne published in 1870. It tells the story of Captain Nemo and his submarine Nautilus, as seen from the perspective of Professor Pierre Aronnax after he, his servant Conseil, and Canadian whaler Ned Land wash up on their ship. On the Nautilus, the three embark on a journey which has them going all around the world, under the sea.