Known by names such as high-crime and saturation patrol, spring offensives, and more recently crime suppression, sweeps consist of LE task forces that often include SWAT, Gang, and Narcotics officers who target known "hot spots" selected by computer analysis of targeted criminal street activity—including drugs and gangs.
LE task forces often consist of SWAT, Narcotics, Gang, Traffic, Patrol, prisoner wagons, and booking officers. Task forces move from "hot spot to hot spot" with undercover spotters providing crime intel, arresting, citing, and towing as they go.
Some sweeps are accompanied by search warrants. For open areas (parks, playgrounds, street corners, etc.) "hammer and anvil" is a highly effective tactic. The "hammer" is one or more units (marked or unmarked) that drive directly at the criminal activity, but not necessarily getting into foot chases. The "anvil" is situated on the opposite side of the "hammer" and is where the bulk of the cars and personnel are situated.
Suspects usually flee from the "hammer" and head straight for the officers in the "anvil." This tactic drastically reduces foot pursuits, and increases the number of apprehensions. Very often, after such sweeps, Patrol benefits from the mere presence of any subsequent police car that will cause the location to clear out.
Some targeted areas are so "hot" that sweeps are sometimes also accompanied by search warrants. The following example illustrates how this works: