On June 4, Columbia's commencement day, Keith Karnofsky, 22, was arrested in a student protest near the campus. A month earlier he had been charged with criminal trespass when New York City police cleared Columbia's buildings of student rebels. Today he is studying to be a rabbi at Manhattan's Hebrew Union College, and he sees no disparity between his radicalism and his faith. As Keith puts it: "Activism is a Jewish thing."
Not all young rabbis are campus radicals, and few members of Students for a Democratic Society have much use for organized religion. Nonetheless, many of the nation's most...