(2) Chairman of the Senate Intelligence Committee who investigated paid, Soviet agents in the U.S. government. This was a result of the conviction of Alger Hiss, a high level employee of the State Department, for perjury. Hiss was responsible for Poland being handed over to the Soviet Union after WWII when he was FDR's State Department advisor at Yalta.
At this time he was also a paid Soviet agent, a fact which he lied about under oath to the U.S. Congress.
(3) Never subpoenaed anyone from Hollywood, contrary to popular belief. This was done by the HUAC, the House Un-American Activities Committee, headed by Richard Nixon, then a Congressman from California.
(4) Everyone he accused of being a paid Soviet agent, was found to be, when de-crypted Soviet era intercepts, released in the 90's, named all of the accused as Soviet KGB and GRU assets.
(5) Patriotic American, successfully vilified by the Left for doing his job, he was unjustly censured by the Senate.