Milwaukee Journal Sentinel: “Sheboygan Women (sic) Files Landmark Case Over Web Links“:

Boyden said some companies require other Web sites to get permission to link to them, but he knew of no companies, much less a government body, that have tried to enforce violations of that condition if the links didn’t infringe on a copyright or trademark.
Boyden said not all speech is protected, including links. For instance, someone might use a link to communicate a threat or violate a copyright, and that wouldn’t be protected.
The lawsuit doesn’t show how Reisinger used the link to Sheboygan police or the city’s cease-and-desist order, but Boyden said it appeared from the lawsuit to be protected speech.