Crowd control

During the 2014 London Marathon, a police officer keeps spectators behind a fence, while first aiders patrol.
Garda Síochána officers on guard duty at a cleared street in Dublin, Ireland, when US president Barack Obama visited the country in 2011.
Kyoto Prefectural Riot Police Unit officers on duty during the Gion Matsuri 2008 festival

Crowd control is a public security practice in which large crowds are managed in order to prevent the outbreak of crowd crushes, affray, fights involving drunk and disorderly people or riots. Crowd crushes in particular can cause many hundreds of fatalities. Effective crowd management is about managing expected and unexpected crowd occurrences. Crowd control can involve privately hired security guards as well as police officers. Crowd control is often used at large, public gatherings like street fairs, music festivals, stadiums and public demonstrations. At some events, security guards and police use metal detectors and sniffer dogs to prevent weapons and drugs being brought into a venue.

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