Those who knew Stalin, such as Khrushchev, suggest that Stalin had long harbored negative sentiments toward Jews that had manifested themselves before the 1917 Revolution.[2] As early as 1907, Stalin wrote a letter differentiating between a "Jewish faction" and a "true Russian faction" in Bolshevism.[2][3] Stalin's secretary Boris Bazhanov stated that Stalin made crude anti-Semitic outbursts even before Lenin's death.
According to historian Yakov Etinger, many Soviet state purges of the 1930s were anti-Semitic in nature, and after more intense anti-Semitic policy toward the end of World War II,[2] Stalin in 1946 allegedly said privately that "every Jew is a potential spy".[2][14] A few years later, after purportedly ordering the development of bombers capable of reaching America and supposedly convinced that Harry Truman was Jewish, Stalin reportedly remarked in private that "we will show this Jewish shopkeeper how to attack us!"[1
After dismissing Maxim Litvinov as Foreign Minister in 1939,[8] S
talin immediately directed incoming Foreign Minister Vyacheslav Molotov to "purge the ministry of Jews", to appease Hitler and to signal Nazi Germany that the USSR was ready for non-aggression talks.
http://en.wikipedia.org/wiki/Stalin's_antisemitism