A political demonstration is an action by a mass group or collection of groups of people in favor of a political or other cause or people partaking in a protest against a cause of concern; it often consists of walking in a mass march formation and either beginning with or meeting at a designated endpoint, or rally, in order to hear speakers. It is different from mass meeting.
Demonstrations may include actions such as blockades and sit-ins. They can be either nonviolent or violent, with participants often referring to violent demonstrations as "militant." Depending on the circumstances, a demonstration may begin as nonviolent and escalate to violence. Law enforcement, such as riot police, may become involved in these situations. Police involvement at protests is ideally to protect the participants and their right to assemble. However, officers do not always fulfill this responsibility and it is well-documented that many cases of protest intervention result in power abuse. It may be to prevent clashes between rival groups, or to prevent a demonstration from spreading and turning into a riot.
