army
arrest
backdrop
background
barb
barbed
barbwire
barrier
blockade
border
camp
cattle
confidential
crime
criminal
defense
enclosure
fence
frame
freedom
guard
interdiction
iron
jail
line
metal
metallic
pattern
perimeter
prison
private
property
protect
protection
punishment
razor
safety
security
sharp
silhouette
spike
spiral
steel
thorn
twisted
violence
wallpaper
war
wire
zone