(1) A person is guilty of an offence if, with intent to cause a person harassment, alarm or distress, he: (a) uses threatening, abusive or insulting words or behaviour, or disorderly behaviour, or (b) displays any writing, sign or other visible representation which is threatening, abusive or insulting thereby causing that or another person harassment, alarm or distress.
http://en.wikipedia.org/wiki/Intentional_harassment,_alarm_o...
http://www.acluohio.org/about/historicacluohiolitigation.asp...
and again in Watchtower Bible vs. Stratton in 2002
Second case is about religious freedom and the government not having the right to out members of a religion.
Neither of the cases are about a person being totally anonymous, or someone spewing hate speech anonymously, or someone bullying someone anonymously.
But hey, people will spin this into "I now have the right to troll a guy's dead grandma."
Additionally, these are just court cases. Sure they have a slight force of law if applied narrowly to similar cases. When I say a right I mean in the constitution or an amendment. People say like to say the constitution allows anonymous speech but it doesn't by any stretch.
So, if I were to be exact: I stand corrected, there are two obscure cases that relate to two small situations not related to the internet which allows for a small amount of anonymous speech, which does not give people a total right to be anonymous all the time.
AFAIK, there's never been a supreme court ruling against anonymous speech rights. There have been lower court rulings against them, usually in cases that look like stalking.
Source?