EXCLUSIVE! Reader Letters Of Hitler Agents In U. S.By JOHN L. SPIVAKNEW YORK—The Dies Congressional Committee, which is supposed to investigate un-American activities, has deliberately suppressed documentary evidence of Nazi propaganda in this country.Letters from Nazi propaganda headquarters in Berlin and Stuttgart, Germany, to agents in the United States and from one agent to another in this country which discuss the shipment of propaganda, including the notorious Primer for school children, are in the possession of the Committee, but have been locked up in their files and kept secret.The letters in the Committee’s possession disclose propaganda shipments from Germany by way of the Nazi diplomatic service, and a close tie-up with Fritz Kuhn, head of the German American Bund.This tie-up, generally known now, has continued to grow upon this country like a cancer since Hitler first got into power, and kept on growing the moment the X-ray light of exposure was turned off.The Congressional Committee turned this light off deliberately(Continued on Page 7)