D.C. MY DEAR MR. SECRETARY: According to a Reuters news dispatch published in yesterdays Washington Posta copy of which is enclosedthe Communist government of Poland is planning to restrict the issuance of tourist visas to Americans and other foreign visitors who may wish to attend religious festivities this summer in connection with the commemoration of the thousand years of Christianity in Poland. Although this is only one step in a comprehensive effort to interfere with the churchs celebration of the anniversary. it represents the extension by the Polish Government of its persecution of the church into the realm of international relations. If the Reuters report Is true. and I assume it is. since it appears to be based on official Communist sources. then I believe the action should be vigorously protested by our Government.