Here are the 10 soviet assets named in the soviet cables McCarthy correctly accused of being communists:
Solomon Adler: Official in the US Treasury Department,
Cedric Belfrage: American Office of Strategic Services ,(predecessor to the CIA)
T. A. Bisson: US Army Board of Economic Warfare,
V. Frank Coe: Official at the US Treasury Department,
Lauchlin Currie: Executive assistant to President Roosevelt,
Harold Glasser: Official at the US Treasury Department,
David Karr: Journalist,
Mary Jane Keeney: US Army Board of Economic Warfare,
Leonard mins: American Office of Strategic Services (OSS),
Franz Neumann: Frankfurt school, OSS agent, and State Department official
These individuals knowingly provided intelligence to the USSR or as US government officials directed US policy in ways favorable to the Soviet Union at the direction of the KGB.
They all continued their activity long past 1945, most into and after the McCarthy era.
> Marquis has established friendly relations with T. A Bisson (hereafter Arthur) who has recently left Board of Economic Warfare; [...] Arthur passed to marquis [...] copies of four documents: (a) his own report for BEW with his views on working out a plan for shipment of American troops to China; (b) a report by the Chinese embassy in Washington to its government in China [...] (c) a brief report of April 1934 on a general evaluation of the forces on the sides of the Soviet-German from [...] (d) a report by the American consul in Vladivostok [...]
Venona: Soviet Espionage and the American Response, 1939-1957, page 229.
These people are not just "named", they were passing sensitive government documents to Soviet agents and a lot more.