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Labor union membership has sunk across the United States over the past 15 years for most jobs except legal workers, mathematicians and, ironically, management, according to a study published Monday. The Pew Research Center's new survey said that the number of union members in jobs classified as "management occupations" rose from 438,000 to 562,000 in the 2000-2014 period. Over the same period, the number of union members in manufacturing jobs fell by nearly half to 1.1 million. In another once relatively strongly unionized sector -- installation, maintenance and repair occupations -- the number of union members fell from 933,000 to 655,000, according to the study.