SECRET GUARD (d) Expressions of opinion by United States officials and representatives which are critical of the policy of the American Government or of other United States officials. (e) Divergences of views on policy between the British Comonwealth and the United States, and reports with a marked anti-American or anti-British tone. (f) Intelligence from delicate sources which might be endangered if it was made known. (g) Matters affecting British trade interests, in which the Americans might be our rivals.