How did world war 1 affect the 4 minute men

4 min men were appointed in theaters and places like that during the war to give lectures during the interception trying to gain public approval for the war and explaining why the war was necessary.  They got their name by the fact that these breaks (changing tapes in the movies theater) ususally lasted 4 minutes.  They were appointed by this federal program whose name i cant remember.

The common sense pamphlet i think