Difficulties with the Soviet Government over the requirement for the registration of Agents in the United States of Foreign Principals, and the exclusion from the mails of Soviet publications as propaganda 23
23. For previous correspondence on these subjects, see Foreign Relations, The Soviet Union, 1933–1939, pp. 926 ff.; Foreign Relations, 1941, vol. i, pp. 699–759, passim; and ibid., 1942, vol. iii, pp. 442–443 and 453.
 Memorandum by the Chief of the Division of European Affairs ( Matthews ) to the Under Secretary of State ( Welles )
 Memorandum of Conversation, by the Assistant Chief of the Division of European Affairs (Bohlen)