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These tensions reflect the fact that Jews have overcome discrimination well enough to become, in the view of some blacks, part of the establishment from which blacks are still mostly locked out. Beyond that, there are historical reasons: Jews once took a leading role in the civil rights movement, and in due course blacks took over that leadership. Such transitions are difficult—for both parties. Now blacks are moving into a new area of assertiveness, foreign policy, and that too, as last week's fusillades demonstrated, will doubtless mean fresh frictions—and not just for Jews.