Anti-semtic censorship of Jewish Books by DBLSome academics distinguish between 5 periods of anti-semitism. The first phase according to Peter Shaefer in Judeophobia or xenophobia because Jews are different, or the "other," in their separation from the host society i.e. not intermarrying. Romans criticized Jews for being lazy i.e. not working on the Sabbath, being clanish, and "impious" or not acknowledging and bowing down to local civic religion. (2) the second phase according to James Parkes is Christian antisemitism from around the 2nd century on to about 1000 CE where for example 3rd C. Council of Nicea and other developments in Christianity set itself apart from the mother Jewish religion as a form off establishing its identities. The Church established itself theologically by demoted Judaism as carnal religion based on the dead letter of the law, as opposed to the new Zion spiritual Christianity based on faith. The 3rd period that includes not only Crusades but later Disputations, is described by Jeremy Brown from roughly 1000 to 14th C. as medieval Jew hatred and Brown shows that the Disputations arose in an attempt to missionize and prove the truth of Christianity by marshalling rabbinic texts. Dispuations include 1240 in Paris with Rabbi Yehiel, 1263 Barcelona with Ramban who wrote the Vikuach, 1414 with Rabbi Yosef Albo, author of Sefer HaIkkarim. Linking Jews with deocide charges and demonization characterized this period according to some academics. The 4th period according to Jacob Katz [in From prejudice to destruction :anti-Semitism, 1700-1933], is constituted by racial anti-semitism.Charges of the Jew as parasites, viruses, vermin played into conspiracy theories of this secular antisemtism. The 5th most recent phase is called by Phyllis Chesler, "the New Antisemitism" which is a form of anti-Israel propaganda such as BDS or anti-zionism.
