Nazism was based on pseudoscience in preparing for and carrying out the Holocaust. Leftwing Anti-Zionism is entirely based on the KGB project of Operation SIG with its deliberate and systematic Anti-Jewish discrimination within propaganda discourses. This is also true of Postcolonialism which was founded with the publishing of Edward Said’s Anti-Semitic book “Orientalism” which despite its pervasive Anti-Semitism is an importantly scholarly work. Anti-Semitism in Postcolonialism is no less founded on Operation SIG than is Anti-Semitism in other leftwing Anti-Zionism. However, there is scientific presumption to this Anti-Semitism as propaganda discourses of Operation SIG are dressed up as pseudoscience. The idea of making Anti-Semitism seem respectable by giving it a pseudoscientific veneer is certainly not new in the history of Anti-Semitism. This must be exposed and discredited from within critical theory itself by means of careful deconstruction.