Despite the extensive government apparatus for policy-making on problems of national security, the American President in the postwar period has, from time to time, appointed groups of private citizens to investigate particular problems and report to the National Security Council. Some of these groups have performed their task without the public's ever becoming aware of their existence; others have in one way or another come to public attention. Among the latter are those which have become known under the names of their chairmen: Finletter, Gray, Paley, Sarnoff, Gaither, Draper, Boechenstein, and Killian. President Truman made use of such groups, and the variety of tasks for which they were appointed grew steadily during the Eisenhower Administration.