Answer:
the secret languages used for communication.
Explanation:For instance, the language Navajo helped U.S Marine Corps to transmit coded messages without any breach with the help of U.S natives, who used their expertise in this language
Yes. If they can justify the concern of public peace and safety as being a more immediate need than convenience of free speech expression at the time or place in question.
Do you mean list people?
Maybe da Vinci or Michelangelo.
Hope this helps :)
