Deng was paraphrasing well-known Chinese proverb. Context was change in Chinese foreign policy, and avoidance of conflict with great powers (mostly US, USSR collapsed soon after) . Before Deng Xiaoping , Chinese policy was to criticize US and USSR on ideological grounds, and sometimes confront them directly (Korea, Vietnam, Sino-Soviet border skirmishes ...) ...
Assuming you accept books as an answer (and your comment suggests that you do) there are at least two wiki pages that list books that have been banned by governments:
List of books banned by governments
List of authors and works on the Index Librorum Prohibitorum, which is to say the Vatican's list.
As you will find from going through the list, books have ...
"Banning harmful imports" was often done.
Prime example being the satanic brew.
Coffee was banned in Mecca, Italy, Contantinople/Ottoman Empire, Prussia.
Similarly: tea was banned in East Frisia, were and when it was already the national drink.
Like all other illict drugs today, they were thought of being too stimulating and foment free thought, and ...