Book excerpt: Publisher's description: Between the first and sixth centuries C.E., a community of rabbis systematized their ideas about Judaism in works such as the Mishnah and the Talmud. David M. Grossberg reexamines this community's gradual formation as reflected in polemical texts. He contends that these texts' primary aim was not to describe real rabbinic opponents but to create and enforce boundaries between rabbis and others and within the developing rabbinic movement.