What measures did wartime governments take to control public opinion? WWI

In
amplifying the previous posts, I would suggest that the passage of the United States Espionage
Act in 1917 represented a severe measure to control public opinion after the United States had
entered the First World War.  The idea of being able control dissent or any opinion that
"is to be used to the injury of the United States" represented one of the most lucid
examples of how war is "the health of the state."  In this light, a nation that
entered the war on the premise of "making the world safe for democracy" had to answer
on its own domestic front for its suppression of it.  The idea of being able to pass such
legislation by a wide majority, enforce it to a great extent, and bolster it with the
preponderance of pro- war propaganda helped to drive home the fact that war centers on the
consolidation of Status Quo power.