Before they could betray America, they first had to betray their own people:

Marxism-Leninism, ideologically incompatible with Judaism, specifically required the Jewish people to dissolve into the international proletariat. As part of its need to eradicate both the Jewish religion and Jewish nationhood, the Soviet Union forbade the teaching of Hebrew, a language essential to both. The “Jewish sections” of the party, the yevsektsii, enforced this program of Sovietization. As the historian Yuri Slezkine writes in his The House of Government, while Polish, Latvian, and Georgian high-ranking members of the party “seemed to assume that proletarian internationalism was compatible with their native tongues, songs, and foods,” high-ranking Jewish members did not speak Yiddish at home or try to pass anything Jewish on to their children. Many proved their new loyalty by pursuing their fellow Jews with special vigor.

When it came to Zionism, the Communist party under Stalin hailed the 1929 Arab pogroms against Jews in Palestine as the start of an Arab Communist revolution and created the watchwords of 20th-century anti-Zionism: a leftist version of anti-Semitism that condemned Jewish national aspirations as a crime against the international order.

Barry Sanders, who honeymooned in the USSR, is an example of this. And of course, the Left continues to blame the Jews for the problems of the Middle East.