Original sentence: The Communist parties, which attracted substantial Jewish support during the 1920s and 1930s, were even more vigorously internationalist and therefore anti-Zionist, if one defines Zionism as the advocacy of a Jewish homeland in Palestine
Edited sentence: The Communist parties, which attracted substantial Jewish support during the 1920s and 1930s, were even more virulently internationalist and therefore anti-Zionist, if one defines Zionism as the advocacy of a Jewish homeland in Palestine