Instruments of ideological repression are propaganda and censorship. During the days of "Marxism-Leninism"  in the Soviet Union -around the early 1930's- students of this particular school of thought were given textbooks that encouraged one particular way of thinking (the Marxist way) as being paramount and the most scientific and true school of thought.
Through ideological repression and control of output information, the Soviet Union was attempting to keep social revolutions at bay. 
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