Got a problem with fascist dictators? Simple, send for Superman.
Superheroes have long been used for various propaganda reasons - in fact the likes of Superman and Batman were being used in the fight against Hitler before America had entered the war. In the Feb 27th 1940 issue of Look Weekly there was story which showed Superman ending the war. He grabs Hitler and Stalin and flies them to Geneva where they are found guilty of unprovoked aggression by the League of Nations. The story infuriated Goebbels so much that he famously proclaimed, 'Superman in a Jew!'
A year later Captain American was launched and the hero was pictured on the cover giving Hitler a jolly good sock on the jaw. This angered American Nazi sympathisers and people opposed to America entering the war. The artists and writers were swamped with hate mail and later they had to be given around the clock police protection. Captain America would continue to feature in stories where he was pitted against an evil axis force. This continued until the war was over and later in the 50's the character became a commie basher.
In more recent years many public service organisations have used the costumed heroes to get their message across. And there was one notorious issue of Spiderman that revealed that Peter Parker had been the victim of homosexual molestation when he was a child. This event though has been written out of the character's official biography.
And even today heroes continue to be used by everyone from government to health organisations. Back in 2005 Donald Rumsfeld appeared on stage with actors in Spiderman and Captain America costumes to support Marvel's Free Comic Books for Troops on the Front-Line Initiative.