By the State Departments own announce. ment of January 16. 1961. such travel by U.S. citizens is in violation of the U.S. law. punishable by penalty of $5.000 or 5 years in jail. or both. It is quite obvious that a number of persons visiting Cuba by this route are engaging in subversive activities and rendering services to the Castro Communist government. which appears obvious for two reasons. the first being that Cuban Embassy approval. thus Castro government approval. is necessary and. secondly. some of those known to have visited Cuba since the State Department announcement have known Communist backgrounds. This open door to subversion in this hemisphere obviously must be closed and I am therefore asking that a strong protest be made to the Mexican Government. urging that government to withhold flight permission from any and all U.S. citizens who attempt. contrary to U.S. laws. to secure passage to Cuba and to demand that the Cuban Government stop issuing visas to those citizens and that all other Latin American governments be encouraged to make a similar demand of Mexico. I am requesting that unified action by all the Latin American countries in this respect be taken up by the State Department through the Organization of American States. believing that a strongly worded protest from that Organization and from a number of Latin American nations and the United States could result in closing this open door to subversion. I am further recommending that the State Department consider.