alertness
barbed wire
blue
building exterior
built structure
burglary
chainlink fence
concrete
contemporary
control
crime
criminal
danger
death
evil
federal building
fence
guilty
justice
lawbreaker
lookout tower
metal
observation point
old
outdoors
penitentiary
prison
prison guard
prisoner
protection
razor wire
security
security guard
security system
steel
surrounding wall
surveillance
thief
tower
wire mesh