Compare these words from William Z. Foster, general secretary of the Communist Party USA, as quoted in Ronald Radosh’s Prophets on the Right:

“Socialist countries will not make war against each other,” Foster predicted confidently, “but will live together harmoniously.” Only a fascist world would be one beset with imperial war; “a socialist world will be a world permanently at peace.”

with this familiar neocon line from Joshua Muravchik’s Exporting Democracy: Fulfilling America’s Destiny:

…the more democratic the world, the more peaceful it is likely to be. Various researchers have shown that war between democracies has almost never occurred in the modern world. … Democracies do not go to war with each other except [in the case of Churchill declaring war on Finland] when they are each fighting for their lives as smaller allies of two warring totalitarian giants. Some exception!

Long before there was democratic peace theory there was socialist peace theory, just as long before Joshua Muravchik was an AEI resident scholar, he was national chairman of the Young People’s Socialist League