In the days leading up to the release of ratings for thousands of New York City public-school teachers on Friday, hundreds of e-mails poured into the in-box of Michael Mulgrew, president of the United Federation of Teachers.
“Enough of cooperation,” one member of the union wrote to his leader. Others prodded Mr. Mulgrew to stand up against Mayor Michael R. Bloomberg, describing him as “untrustworthy,” in what he said was a call to arms of unparalleled intensity.
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