Others have joined in warning that the loss of China to the forces of communism can well mean the 1oss of all Asia. with the resulting peril to the security of our own country. Mr. President. the freedom with which representatives of the Soviet Union and other iron curtain countries move tbout the United States has become notorious. Without success. some of us have attempted to establish a strict rule of reciprocity between the United States and Russia in the matter of visas and access to information. That attempt has been frowned upon. to the extent that such proposals have been pigeonholed. Mr.