He was noted for claiming that there were large numbers of [[Communist Party|Communists]] and [[Soviet Union|Soviet]] spies and sympathizers, engaged in a conspiracy to undermine the United States, inside the federal government. He was proven correct by government documents and inquiry, including decrypted [[Venona]] files. | He was noted for claiming that there were large numbers of [[Communist Party|Communists]] and [[Soviet Union|Soviet]] spies and sympathizers, engaged in a conspiracy to undermine the United States, inside the federal government. He was proven correct by government documents and inquiry, including decrypted [[Venona]] files. |