From F. A. Hayek:
The term "intellectuals," however, does not at once convey a true picture of the large class to which we refer, and the fact that we have no better name by which to describe what we have called the secondhand dealers in ideas is not the least of the reasons why their power is not understood. Even persons who use the word "intellectual" mainly as a term of abuse are still inclined to withhold it from many who undoubtedly perform that characteristic function. This is neither that of the original thinker nor that of the scholar or expert in a particular field of thought. The typical intellectual need be neither: he need not possess special knowledge of anything in particular, nor need he even be particularly intelligent, to perform his role as intermediary in the spreading of ideas. What qualifies him for his job is the wide range of subjects on which he can readily talk and write, and a position or habits through which he becomes acquainted with new ideas sooner than those to whom he addresses himself.
Until one begins to list all the professions and activities which belong to the class, it is difficult to realize how numerous it is, how the scope for activities constantly increases in modern society, and how dependent on it we all have become. The class does not consist of only journalists, teachers, ministers, lecturers, publicists, radio commentators, writers of fiction, cartoonists, and artists all of whom may be masters of the technique of conveying ideas but are usually amateurs so far as the substance of what they convey is concerned. The class also includes many professional men and technicians, such as scientists and doctors, who through their habitual intercourse with the printed word become carriers of new ideas outside their own fields and who, because of their expert knowledge of their own subjects, are listened with respect on most others. There is little that the ordinary man of today learns about events or ideas except through the medium of this class; and outside our special fields of work we are in this respect almost all ordinary men, dependent for our information and instruction on those who make it their job to keep abreast of opinion. It is the intellectuals in this sense who decide what views and opinions are to reach us, which facts are important enough to be told to us, and in what form and from what angle they are to be presented. Whether we shall ever learn of the results of the work of the expert and the original thinker depends mainly on their decision.