Whether Spence's display of an upside-down American flag bearing a peace symbol was expressive conduct protected by the First and Fourteenth Amendments.
Holding
Yes. In its specific historical context, Spence's display was protected symbolic expression.
Reasoning
The Court rejected the notion that any conduct becomes speech merely because the actor intends to convey an idea. But Spence satisfied the relevant threshold: he intended to communicate a particularized message, and the surrounding circumstances made it highly likely that viewers would understand it.
Flags have long been recognized as potent symbols capable of communicating ideas quickly and effectively. Here, the American flag, its upside-down display, and the prominent peace symbol worked together to express opposition to war and violence.
Context gave the display its meaning. Spence acted shortly after the Cambodian invasion and the Kent State killings, events of intense national concern. In that setting, most viewers would have understood the display as a political protest rather than meaningless or bizarre conduct.