 In the early days of the Soviet Union and in other countries, ideological repression was carried out by political repression of the carriers of competing ideologies.Instruments of ideological repression are propaganda and censorship.During the days of "Marxism-Leninism"  in the Soviet Union -around the early 1930s- 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.