On 8 February 1922, he stated he was preparing to publish a book titled The Unknown in History, but later on that same day he was stopped by armed men posing as US government officers, who seized a manuscript copy of the book in an effort to stop its publication. However, he had another manuscript copy of the book which was not confiscated.
https://en.wikipedia.org/wiki/Arthur_Cherep-Spiridovich
No need to ban the book. Just warp the minds of others.