Mr. Stern. Yes, sir.
Mr. Dulles. I note that this list does not include membership in various types of organizations, such as the, for example, the organizations that are on the Attorney General's list. Have you ever considered that?
Mr. Bouck. Yes; if I might explain, sir; the letters we are talking about are letters that are written by people, and they rarely include that kind of information, but we do in other categories, this is for a special purpose. This is letters only that are sent to the President which is all this is applied to. This does not apply to other sources of information, only the one source of letters.
Mr. Stern. Have you had occasion, Mr. Bouck, before Dallas, to put in writing criteria to be employed by Secret Service agents in dealing with uninvited callers at the White House?
Mr. Bouck. Yes, sir.
Mr. Stern. I show you now a document which I have marked for identification Commission Exhibit No. 764, one page, entitled "The following criteria are used as guides in determining whether White House callers should be committed for mental observation." Do you recognize that?
Mr. Bouck. Yes, sir.
Mr. Stern. Did you have it prepared?
Mr. Bouck. I did.
Mr. Stern. How was this employed?