Wiki only goes back to his parents, not his grandparents:
Elliott Abrams was born into a Jewish family in New York in 1948. His father was an immigration lawyer. Abrams attended the Little Red School House in New York City, a private high school whose students at the time included the children of many of the city's notable left-wing activists and artists. Abrams' parents were Democrats.
I saw that. Virtually all Leftist Jews have roots in Eastern Europe/Soviet Union/Russia. We’ll likely never find out!