{{cquote|In conversation, Hiss disclosed to Oumansky, and then Litvinov, official U.S. attitudes and plans; he was also very close to our sources who were cooperating with Soviet intelligence and to our active intelligence operators in the United States. Within this framework of exchange of confidential information were references to Hiss as the source who told us the Americans were prepared to make a deal in Europe.<ref>Anatoli Sudoplatov, Pavel Sudoplatov, Leona P. Schecter and Jerrold L. Schecter, ''Special Tasks'' (New York: Back Bay Books, 1995) ISBN 0316821152, p. , p. 227</ref>}}
At the conference, the U.S. ceded hegemony over Eastern Europe to Stalin and made a secret agreement giving the Soviet Union three votes in the UN to one for the U.S.<ref>Ralph de Toledano and Victor Lasky, [http://www.americandeception.com/index.php?action=downloadpdf&photo=/PDFsml_AD/Seeds_Of_Treason-Ralph_de_Toledano_and_Victor_Lasky-1950-278pgs-POL.sml.pdf&id=343&PHPSESSID=b964065077a1de19538c4c7b1cf9e825 ''Seeds of Treason: The True Story of the Hiss-Chambers Tragedy''], (NY: Funk and Wagnalls, 1950), ASIN B0007DS43A pp. 107-109.</ref> According to confidential [[GRU]] sources, during the conference, Hiss gave daily briefings to General [[Mikhail Abramovich Milshtein]], a military adviser to Stalin and the deputy director of the [[GRU]], revealing not only the American negotiating strategy but insights into the attitudes of the American negotiators.<ref>Jerrold and Leona Schecter, ''Sacred Secrets: How Soviet Intelligence Operations Changed American History''(Washington: Potomac Books Inc., 2002) ISBN 1574883275, p. 130</ref>After the conference, Hiss went on to Moscow, where he was decorated with the Order of the Red Star.<ref>Jerrold and Leona Schecter, ''Sacred Secrets: How Soviet Intelligence Operations Changed American History''(Washington: Potomac Books Inc., 2002) ISBN 1574883275, p. 131</ref> by Foreign Minister V.M. Molotov.<ref>Ralph De Toledano, “The Last Word,” ''Insight on the News'', December 17, 2001</ref>
After the Yalta conference Hiss traveled on to Moscow with Secretary of State Stettinius, [[Venona project|Venona]] transcript decryopt #1822 dated 30 March 1945 reads:
{{cquote|"Addendum to our telegram no.28 as a result of a conversation of “Pya” with Ales, it turns out:
1. Ales has been continuously working with the [[GRU|neighbors]] since 1935.