He was also a member of the Subcommittee on Internal Security . He was a strong supporter and friend of Joseph McCarthy and engaged in McCarthyism . Jenner and McCarthy were both part of " a core of isolationist Republicans in the Senate " along with Herman Welker of Idaho and George W. Malone of Nevada . In 1950 , when McCarthy issued a report falsely accusing a number of State Department employees of being secret Communists ( see Tydings Committee ) , Jenner supported him , claiming that the State Department had engaged in " the most scandalous and brazen whitewash of treasonable conspiracy in our history " and stating : " Considering the fact that we are now at war ... how can we get the Reds out of Korea if we can not get them out of Washington ? " When McCarthy was censured by the Senate in 1954 , Jenner gave a speech suggesting that censure resolution " was initiated by the Communist conspiracy . " In the Senate , Jenner was a strident opponent of General George Marshall , who was appointed Secretary of Defense in 1950 . During the confirmation debate , Jenner and McCarthy was part of a group of militantly anti-communist Republican Senators that attacked Marshall . Jenner " delivered a shrill , hour-long attack on the nominee " in which he also disparaged President Harry S. Truman and Secretary of State Dean Acheson . Exemplifying McCarthist rhetoric , Jenner accused the Truman administration of " bloody tracks of treason " and called Marshall " a living lie " who was " joining hands once more with this criminal crowd of traitors and Communist appeasers ... under the direction of Mr. Truman and Mr. Acheson . " Jenner also " denounced and blamed Marshall for the Pearl Harbor defeat and for his role in helping FDR ' trick America into a war , ' the extension of lend-lease to the Communist Soviet Union , the ' selling out ' of Eastern Europe at Yalta , the loss of China , and the inclusion of an offer of aid to the Soviet Union under the Marshall Plan . " When Marshall was informed of Jenner 's speech , the former general replied : " Jenner ? Jenner ? I do not believe I know the man . " In 1951 , after President Truman dismissed General Douglas MacArthur for insubordination , Jenner gave a speech on the floor of the Senate in which he said : " I charge that this country today is in the hands of a secret inner coterie , which is directed by agents of the Soviet Government . Our only choice is to impeach President Truman and find out who is the secret invisible government . " Jenner introduced legislation that sought to strip the Supreme Court of jurisdiction " in all the areas where it had interfered with the anticommunist program , " a measure that Senator Lyndon B. Johnson maneuvered to oppose . Ultimately , Jenner 's measure was tabled by a vote of 49-41
Yalta
Yalta Conference
William E. Jenner