The document discusses Senator Joseph McCarthy's anti-communist campaign and his role as a Republican senator from Wisconsin from 1947 until 1957. It highlights his accusations about communist infiltration in the U.S. government and critiques the political and media establishment that opposed him, suggesting that many of his claims have historical validity supported by subsequent evidence. The document also emphasizes that concerns about communist subversion did not end with McCarthy's censure in 1954, indicating a continued relevance of his warnings to contemporary discussions on security.