Answer:
Yelling "fire" at a crowded concert
Speech that incites violence
Physical threats
Defamation of character
Step-by-step explanation:
It is illegal to yell "fire" at a crowded concert because it disrupts the peace, as well as using that speech that incites violence.
Physical threats are also illegal and someone's reputation is their property right, so defamation of character is illegal too.
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~Roi