Why are restrictions placed on some forms of speech?

communist countries and places where you aren't allowed to have freedom of speech.

Explanation:

The government or whoever rules that province or country doesn't want it's citizens to have a freedom so say what they want in public or on social media or anywhere for that matter. They want the citizens to obey their rules and regulations and not believe anything else then what they want them to believe.

the right answer is the end of world war ii

after the end of a global wwii all the nations involved, in an attempt to create an organization to maintain world peace. this agreement would work settling international disputes via negotiation and arbitration instead of leading the issues escalate to another war.

they were byzantines