Sentence:  In each of the last , the trial marked the beginning of a new course : in Moscow the liquidation of the Old Bolsheviks and the tightening of Stalin 's <WSD>dictatorship</WSD> ; in the United States the initiation of militant anti Communism , with the repentant ex Communist in the vanguard . 
Meaning of the word marked with <WSD> tags:  a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.)