Lebensraum was one of the major political ideas of Adolf Hitler, and an important component of Naziideology. It served as the motivation for the expansionist policies of Nazi Germany, aiming to provide extra space for the growth of the German population, for a Greater Germany. In Hitler's book Mein Kampf, he detailed his belief that the German people needed Lebensraum and that it should be found in the East. It was the stated policy of the Nazis to kill, deport, or enslave the Polish, Russian and other Slavic populations, whom they considered inferior, and to repopulate the land with Germanic peoples. The entire urban population was to be exterminated by starvation, thus creating an agricultural surplus to feed Germany and allowing their replacement by a German upper class.