The 20^th century was the most violent century in human history as 19^th century German Marxism was instituted by violent revolution and thoroughly applied by dictators in many countries around the world leading to the deaths of more than 100 million people- many by execution, starvation and the Gulag, and the gathering into heaven of the largest number of Christian martyrs in Church History. These lectures survey the personal lives and ideology of five of the most brutal tyrants, and offer reflections upon the principles behind their tyranny – principles that continue to threaten the West today and are appearing in mainstream American politics.