The only defense against enemy use of radio monitoring or broadcasting consists of the application of wired radio--which means plugging all the radio sets in on the telephone circuit, putting nothing on the air, and defying the enemy to eavesdrop. If the radio sets are then policed, and are made incapable of receiving wireless material, that particular audience is effectively cut off from the enemy. (When the Red Army, with its acute propaganda-conscious security, moved into many Eastern European cities, the first thing it did was to round up all the radios which the Nazis had overlooked. This prevented the liberated peoples from being enslaved by the "filthy reactionary lies" of the American and British governments, and made sure that the peoples would stay liberated under influence of their local Soviet-controlled newspapers.) Wired radio is expensive. Radio suppression is difficult; the successful concealers of radio receivers become two-legged newspapers and go around town spreading all the hot dope which the authorities are trying to suppress. Scarcity puts a premium on such news; rumor then becomes unmanageable. Except for strangely drastic situations, it is probable that the great powers will continue to tolerate radio reception even though it may mean letting foreign subversive propaganda slip in now and then. It is therefore likely that radio broadcasts will be available for monitoring for the pre-belligerent stages of the next war, should war come again in our time, and that radio may last through a great part or all of the duration of the war. Factors which cannot now be foreseen, such as radio control of weapons, will affect this. Radio propaganda analysis follows the same considerations as those which govern choice of materials for analyzing printed matter. It is a surer method to follow one or two programs on a station than to make wide random selections. A standard-wave transmitter to the home audience comes closer to revealing the domestic scene than would a global rebroadcast of ostensibly identical material. Radio has a further advantage over print. Few nations print out separate propaganda for each foreign-language area, while almost every large and medium-sized country has international facilities for broadcast. Since the programs are beamed to different language groups, the senders automatically make up propaganda lines for each audience.[31] Attentive monitoring can provide material for distinguishing the various lines which any given nation is sending out to its friends, neighbors, or rivals. Frequently the differences between these lines make good counterpropaganda. If you hear the Germans telling the Danes that all Nordics are supermen and all non-Nordics scum, while telling the Japanese that the National Socialist idea of the world transcends pluto-democratic race prejudice, put the two quotations together and send them back to the Danes and the Japanese both.