© MMX V.1.1.1
by Morley Evans
Killing Masses is Easy, it does not require anything elaborate. A chain-link fence will do. A siege is very effective.
All that is required is to enclose large numbers of prisoners in an area where they can't get out and then do nothing to look after them. If they do not have water, food, sanitation or shelter, they will die. The captors can shoot anyone who tries to escape. The captives will die in only a few weeks, or even in a few days if they are already weakened or wounded. Their captors don't have to do anything.
Siege is exactly what the Wehrmacht did with the gigantic Soviet armies that were captured in the first months of Operation Barbarossa in WW II. It was part of the Commissar Order  which empowered German soldiers to treat enemies barbarically in the east. Those on trial at Nuremberg acknowledged that such atrocities were committed, including the sieges of the Warsaw Ghetto and Leningrad. 
According to James Bacque, a Canadian author, the American and French captors besieged German captives after the War killing around one million Germans who had surrendered.   Bacque was ably assisted in research by Col. Ernest F. Fisher, a senior historian of the U.S. Army   and enthusiastically supported by Stephen Ambrose until Ambrose was assigned to write the official biography of Dwight D. Eisenhower.
The Israelis currently have 1.5 million Palestinians under siege in Gaza an area of only 139 square miles. Because the Palestinians have a few resources and the Israelis allow a trickle into Gaza, the people there are dying slowly after they have been strangled for years.  The Gaza Strip today is a very close parallel to the Warsaw Ghetto.
Building camps and providing food and shelter for prisoners, which the Nazis did for Allied airmen (who were carpet bombing German cities throughout the war) and other prisoners (including Jews, communists, Gypsies and homosexuals) is costly and even generous — however miserable — when one is locked in a life and death struggle.
The horrific pictures taken for propaganda by American cameramen in German camps as they were captured by Allied armies were typhus victims  who died because sanitation could no longer be maintained — due to the Allied offensive itself and the utter collapse of the Nazi regime.
All the Nazi concentration camps in the west were originally designated as "death camps" but no one calls them that today. The recognized "death camps" today were all inside the Soviet sector where no Allied soldier, or cameraman, ever set foot and some of the most ferocious battles in history were taking place. It was Hell on earth for all.