The art of leadership. . . consists in consolidating the attention of the people against a single adversary and taking care that nothing will split up that attention. . . .
Source: Mein Kampf, vol. 1, ch. 3, 1925.
-- Adolf Hitler, (Apr 20 1889-1945), German political leader; He founded National Socialism; started WW II; and engineered the Holocaust murder of over six million Jews.