Although these and other Jewish groups are not alone in their concerns about rising anti-Semitism in Europe, their fear of the far right often obscures the indisputable fact that some of the greatest threats to Jews (and Israel) in contemporary Europe stem from the left side of the political aisle. Indeed, it is no big secret that all across the European continent, left-wing intellectuals are playing a crucial role in making anti-Semitism seem respectable. Of course, they are (usually) careful to promote their hatred of Jews only indirectly. Instead, modern anti-Semitism is typically disguised as anti-Zionism and an obsession with Palestinian victimhood.
European Judeophobia often takes on new life forms such as anti-Semitic boycott campaigns and anti-Israel demonstrations, the growing intensity of which the European left not only overlooks or obscures but often actively supports. It is transmitted by Europe’s left-leaning mass media, which not only believes that the systematic demonization of Israel promotes the postmodern and postnational ideological worldview of Europe’s governing class, but also appeases the wrath of Europe’s Muslim immigrants, lest they expose the myth of European socialist multicultural utopia.
http://www.hudsonny.org/2009/06/european-left-is-more-dangerous-for-jews-than-the-european-right.php