"Thousands of scientists, engineers, doctors, lawyers, teachers, and managers were hit by the Nazi purge of independent thinkers in every part of German life. ???Hitler shakes the tree,??? said one American arts administrator, ???and I collect the apples.??? The choicest apples included such men and women as Bruno Walter, George Szell, Lotte Lenya, Paul Klee, Thomas Mann, and Hannah Arendt in the a" . . . . . .