Public Forum Doctrine: The Rules

Consider this excerpt from the Krishna case:

These cases reflect, either implicitly or explicitly, a “forum based” approach for assessing restrictions that the government seeks to place on the use of its property. Under this approach, regulation of speech on government property that has traditionally been available for public expression is subject to the highest scrutiny. Such regulations survive only if they are narrowly drawn to achieve a compelling state interest. The second category of public property is the designated public forum, whether of a limited or unlimited character-property that the State has opened for expressive activity by part or all of the public. Regulation of such property is subject to the same limitations as that governing a traditional public forum. Finally, there is all remaining public property. Limitations on expressive activity conducted on this last category of property must survive only a much more limited review. The challenged regulation need only be reasonable, as long as the regulation is not an effort to suppress the speaker's activity due to disagreement with the speaker's view.