This study presents an historical account of the expansion of United States interests in Latin American communications in the first half of this cntury. Particular emphasis is placed on how United States shortwave broadcasting was used as a vehicle for the penetration and dominance of Latin American mass communication systems. This penetration is analyzed in relation to the overall context of the goals and activities of the Good Neighbor Policy of Franklin D. Roosevelt. Conversely, with the development of shortwave broadcasting as a tool of foreign policy, there arose the need to restructure the traditional relations between the broadcasting industry and government. This study describes the process by which the American broadcasting industry came to accept government control and dominance in the field of international broadcasting. Finally, this study attempts to show how such an historical account as this can be used to eluciate the notion of media imperialism.