Americans have always been able to speak their minds in their own homes, and even outside of them by, say, erecting signs in their yards or passing out leaflets from their property. But as the young nation matured, the Supreme Court began placing limits on when people can heedlessly flap their gums. In Hague v. C.I.O. (1939), the Court ruled people can speak freely in government locales such as parks, sidewalks and the front steps of the state capital — sites that have long been used as public forums for such speech [source: McWhirter].
But since that ruling, the Court further stipulated in other cases that governments can control the time, place and manner of speech in public forums, but only for good reasons and with reasonable regulations. However, it also introduced the concept of "limited public forums," where free speech can be restricted.
The 1981 ruling on the topic was in regard to the Minnesota State Fair, which required any literature sold or distributed at the fair be done so from booths rented on a first-come, first-served basis. The International Society for Krishna Consciousness, objected; it wanted to sell its literature by walking through the fairgrounds. But the Court said the fairgrounds were not a public forum, but rather a limited public forum. (With 100,000 people coming through each day, traffic needed to be controlled somehow.) Thus, the fair could place some regulations on free speech [source: McWhirter].