Nineteen Roman Catholic bishops, nine of them Americans, have resigned since 1990 in the context of sex scandals. U.S. cases: --Cardinal Bernard Law, archbishop of Boston, on Friday, following months of criticism for his mishandling of sex abuse claims against priests. --Bishop J. Kendrick Williams of Lexington, Ky., on June 11, following allegations he abused two minors and an 18-year-old decades ago, which Williams denied. --Auxiliary Bishop James McCarthy of New York, on June 11, after apologizing for affairs with adult women. --Archbishop Rembert Weakland of Milwaukee, following May 23 news that his archdiocese paid $450,000 to a man claiming...