In this cartoon, what fear is most likely represented by the question mark that could justify a state's right to limit an individual's constitutional rights?

the image:

a man about to step down a set of stairs (his pants say labor)
the steps go down saying:
strikes - walk outs
bolshevism - murders
chaos
and then on the floor a question mark

A violent uprising leading to the overthrow of the government
A collapse of the economic system followed by years of poverty
An election of a socialist government
An invasion by an enemy state