Did You Know
SEIU was the most successful of the top 10 unions, winning 72.9 percent of the NLRB elections in which it participated. The Machinists ranked second, winning 70.1 percent of its elections, followed by IBEW (67.3 percent), IUOE (63.9 percent), and the Laborers (60.3 percent).
Of the top 10 unions, SEIU also organized the most workers -- 15,130 -- followed by the Teamsters with 8,146.
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