This has a date line from Copenhagen. August 20. and is a story about a Prof. Mogens Fog. a scientist who once was a proCommunist Member of Parliament. who said he had been denied a visa to enter the United States. Fog was representing the Danish physicians at an international Medical Congress opening in Chicago in about 10 days. A foremost neurologist. he teaches at Copenhagen University. The article reads. in part: Fog said the refusal was not known here until quite recently. although the request for a visa was filed in February and we have pressed for an answer several times. In Washington. State Department officials said Fog is a longstanding Communist and under the law is not eligible for a visa. He is sponsored by the World Medical Association and the World Health Organization. The article continues: Last year. Dr. Morten Simonsen. an outstanding Danish scientist. was denied a visa for entry into the United States. where he had been invited to make lectures at the American Academy of Science and two universities. When the universities protested to the Attorney General. the visa was finally granted. Like Simonsen. Fog is a leading member of the Socialist Peoples Party. formed by the former Communist Party chairman.