Ключевые слова: area, background, barb, barbed wire, barbwire, barrier, border, border control, boundary, concept, crime, criminal, danger, defend, defense, escape, felon, fence, forbidden, frame, freedom, guard, ideas, immigration, imprisonment, jail, military, outlaw, penitentiary system, prison, private, property, protect, punishment, razor, rebellion, rescue, restricted, safety, secret, security, sharp, snow, spyware, steel, stop, terror, warning, winter, wire,