A demonstration is an historically and geographically common form of nonviolent action by groups of people. The term "demonstration" was coined in the United States during the civil rights movement of the 1950s-1970s and refers to the public display of the common opinion of a group of people, a concept developed by Mahatma Gandhi during the Indian independence movement and by Martin Luther King, Jr. during the American civil rights movement. Demonstrations are a form of activism, usually taking the form of a public gathering of people in a rally or walking in a march. At times, more interventionist actions such as blockades and sit-ins have been referred to as demonstrations. Thus, the opinion is demonstrated to be significant by gathering in a crowd associated with that opinion.
Demonstrations can be used to show a viewpoint (either positive or negative) regarding a public issue, especially relating to a perceived grievance or social injustice. A demonstration is usually considered more successful if more people participate. Topics of demonstrations often deal with political, economic, and social issues.
Demonstrations are sometimes spontaneous gatherings, but are also utilized as a tactical choice by movements. They are one tactic available to proponents of strategic nonviolence. Demonstrations are generally staged in public, but private demonstrations are certainly possible, especially if the demonstrators wish to influence the opinions of a small or very specific group of people. Demonstrations are usually physical gatherings, but virtual or online demonstrations are certainly possible.
Sometimes, particularly with controversial issues, groups of people opposed to the aims of a demonstration may themselves launch a counter-demonstration with the aim of opposing the demonstrators and presenting their view. Clashes between demonstrators and counter-demonstrators may turn violent.
Locations are also frequently chosen because of some relevance to the issue at hand. For example, if a demonstration is targeted at issues relating to foreign nation, the demonstration may take place at a location associated with that nation, such as an embassy of the nation in question.
A growing trend in the United States has been the implementation of "free speech zones," or fenced-in areas which are often far-removed from the event which is being protested; critics of free-speech zones argue that they go against the First Amendment of the United States Constitution by their very nature, and that they lessen the impact the demonstration might otherwise have had.
In many areas it is required to get permission from the government to hold a demonstration.
Human rights groups fear the powers could hinder peaceful protest. Nick Clegg, the Liberal Democrat home affairs spokesman, said: "I am not aware of vast troops of trespassers wanting to invade MI5 or MI6, still less running the gauntlet of security checks in Whitehall and Westminster to make a point. It's a sledgehammer to crack a nut." Liberty, the civil liberties pressure group, said the measure was "excessive".