Radio broadcasting, which had been used during the war to mobilize the population. [fact]
After the war, the Soviets would repay the compliment: Stalin and the rest of the Politburo concluded that Soviet propaganda needed to operate at a greater scale, for the Germans had shown what it meant to be truly pervasive. Radio broadcasting, which had been used during the war to mobilize the population, was continued and supplemented with television. The Soviets would never fully match the degree of organizational skill of the Nazis, or the spiritual cultivation—such perhaps are the limits of Marx's materialism.
Tim Wu, The Attention Merchants, loc. 427