Attorney General (Tom C. Clark at that time) made recommendations that included "relaxing the universal ban on wire tapping"–at which time, Lowenthal "noticed that that was in the list." In 1948, Truman felt (according to Lowenthal in 1967) that the Mundt-Nixon Bill that year was "to punish sedition." FBI and HUAC investigations During 1947-1948, the FBI investigated Lowenthal. They used wiretaps, as evidenced in later-FOIA-ed FBI files. FBI files on Lowenthal also include draft versions of his 1948 book on the FBI. In 1950, Lowenthal published a book critical of the Federal Bureau of Investigation (see Works, below), which led to him being called before the House Un-American Activities Committee, where he denied he had "aided and abetted" Communist in government service . The book and negative press helped end a 38-year career in public service. On August 28, 1950, Lee Pressman testified that he had not recommended Lowenthal for a job at the War Production Board. On September 1, 1950, Charles Kramer refused to answer questions as to whether he was acquainted with Lowenthal. That same day, U.S. Representative George A. Dondero called Lowenthal a "menace to the best interests of America." Dondero said that his government career was "replete with incidents where he aided and abetted Communists" starting in 1917. On September 15, 1950, Lowenthal appeared before the House Un-American Activities Committee AKA "HUAC" (two of whose members were Mundt and Nixon–of the Mundt-Nixon Bill). Already in August 1950, HUAC had re-subpoenaed four witness who had been part of Whittaker Chambers's Ware Group: Lee Pressman, Nathan Witt, Charles Kramer and John Abt. The committee had asked both Pressman and Kramer whether they knew Lowenthal; both confirmed. Lowenthal brought former U.S. Senator Burton K. Wheeler as counsel. After reviewing his curriculum vitae, the committee tried to link him with known or alleged Communist Party members and organizations, some of which he confirmed, others not, all without admitting any wrongdoing. Names mentioned included: Alger Hiss, Donald Hiss, David Wahl, Bartley Crum, Martin Popper, Allan Rosenberg, Lee Pressman, the Russian-American Industrial Corporation, the Twentieth Century Fund, and the International Juridical Association. On November 19, 1950, the government published Lowenthal's closed-session testimony from September 15, 1950. During testimony, Lowenthal had denied aiding or abetting Communists in government service. Specifically, he denied any involvement in the employment or sponsoring of George Shaw Wheeler, a former US government employee who had defected to Czechoslovakia