Question: Is there a word or short phrase, which describes or implies the destruction of books or libraries?

Answer: 
Since *biblioclasm* is basically unheard of in the English language, and *bibliopyrosis* was **literally** unheard of prior to this question, I think the question deserves an answer that will actually be recognized:

> 
> ### book burning
> 
> 
> *noun*
> 
> 
> : destruction of writing or pictures regarded as politically or socially harmful or subversive or produced by persons whose ideas or acts are so regarded
> 
> 
> 

([Merriam-Webster Dictionary](https://www.merriam-webster.com/dictionary/book%20burning))

Despite the use of the word “burning,” *book burning* is used to describe the destruction of books for political purposes regardless of the actual method of destruction. The phrase is an allusion to the infamous book bonfires performed by the Nazis, but of course the large-scale destruction of books for political purposes is vastly older than that. It is widely understood, thanks in part to *Fahrenheit 451* and other media, such as *Indiana Jones and the Last Crusade* which includes a Nazi bonfire.
Just to go in a different direction here: [bowdlerize](https://www.merriam-webster.com/dictionary/bowdlerize)
 to modify by abridging, simplifying, or distorting in style or content.