How does dictatorship establish order?

Dictatorships work because everybody is doing something like a job and the economy is flourishing and no one is on the streets.

Very bad answer. Dictatorships are not ECONOMIC systems, but governmental systems. A Dictatorship can have widespread poverty (Mao's China, Tito's Yugoslavia) or be rolling in riches (Caesar's ROme, Chavez Venezuela)

Many dictatorships were troubled by many unemployed and irate in the streets.