Special Weapons And Tactics
SWAT teams are situated in large cities, but some organisations (like the FBI) have similer teams.
SWAT is somewhat a police special forces, handling situations too dangerous for normal police officers. Such as multiple armed suspects, barricaded armed suspects, hostage situations, among others.
Side note: although the cops in america seem crooked, the police in england are polite, friendly, and helpful.
"Talk, we need SWAT in here, multiple suspects armed with automatic weapons on the corner of 12th and main"
"10-1 but acknowledged"