Intensive campaigns of hostile and subversive propaganda against the territorial integrity and political order of foreign states have constituted one of the most disturbing factors in the international life of the postwar period. Powerful groups, frequently with governmental toleration or support, clamor for the incorporation in their several states of territories inhabited by populations of like nationality. Vigorous and systematic incitement of foreign subjects to disaffection or revolt against their own governments is the method generally adopted to attain this end. The consequent state of tension in the relations of the states concerned presents a real and actual threat to international peace. The dangerous situations which always result from a lack of coincidence between national and political frontiers have been intensified by the rise in several states of dictatorial régimes, which are disposed to press with special vigor their territorial claims. Hostile propaganda, especially if carried on with the sanction of nationalistic governments, “inevitably results in what might be termed the obliteration of the border-line between the state of peace and the state of war.” It tends always to create an atmosphere conducive to the occurrence of those “incidents” which have so frequently led to major conflicts.