"The names of Lenin, Stalin, and Hitler will forever be linked to the tragic course of European history in the first half of the twentieth century. Only weeks after the Russian Revolution the Bolsheviks created secret police forces far more brutal than any that had existed under the tsar. The Nazis followed suit and were no sooner in power than they instituted the dreaded Gestapo. Under both regimes millions of people were incarcerated in concentration camps where they were tortured and frequently worked to death."