Where does legitimate criticism of the State of Israel 's policies end, and   antisemitism begin? This question has come up because of a resolution adopted by a regional branch of Germany's  Left Party addressing Israel's actions in the Gaza Strip and the West Bank. "The Left Party in Lower Saxony rejects the Zionism that actually exists today," is the heading of the controversial text .  Where this dividing line runs is a question that Stefanie Schüler-Springorum confronts time and again. She is the director of the Center for Research on Antisemitism at the Technical University of Berlin and a co-author of the so‑called Jerusalem Declaration on Antisemitism (JDA).   That declaration, published in 2021, serves as a counterproposal to the definition issued by the International Holocaust Remembrance Alliance (IHRA) in 2016.  For the JDA, an international group of experts responded to what they viewed as the IHRA's blurred distinction between antisemitic speech and legitimate…