arrest
barrier
bars
behind
border
boundary
cage
caution
chain
chained
closed
concept
coronavirus
covid
crime
criminal
danger
epidemic
fence
forbidden
freedom
grid
guilty
hand
hold
human
iron
isolated
isolation
liberty
limitation
lock
pandemic
prison
prisoner
protect
protection
punishment
quarantine
restricted
restriction
safety
secure
slave
steel
stop
struggle
symbol
trapped
violence