crowd control
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riot controlpolicesecurityriotbarrierbarricadeperimetercontainmentsurveillancemarshalstewardofficerpatroldemonstrationprotestrallygatheringmobthrongcongestionstampedepanicevacuationingressegressbottleneckcapacitydensityflowcheckpointturnstilefenceshieldhelmetarmorbatontear gaspepper spraysirenmegaphonedispatchcommandstrategytacticdeploymentformationcordonblockadeinterventionpacificationsuppressionorderchaosdisturbanceuprisinginsurrectionpublic safetylaw enforcementvigilancestadiumarenaconcertfestivalparadeairportstationlobbyqueuelineupaccess controlsecurity guarddisruptionclashscufflemeleebrawlarrestdetentionescortclearance