Both the Jacobins and Bolsheviks butchered their upper ruling classes and executed their royal families. They broke with Christianity and waged war on it, intending to wipe it off the face of the earth. They succeeded in involving the people of the nations in wars fought with energy and enthusiasm - the revolutionary wars of the past, the war against Germany today. Their theories and revolutionary ideas had enormous influence beyond the borders of their own countries. The methods of National Socialism are different, but basically they too pursue a single idea: the extermination and annihilation of people who think differently from them.
Szpilman, The Pianist, page 193. Diary entry, 18 January 1942.