Definition of the GMB from the Oxford Advanced Learner's Dictionary

 

the GMB

 
BrE
 
; NAmE
 
the General, Municipal and Boilermakers Union
BrE
 
; NAmE
 
 
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one of the largest British trade unions, formed in 1989 when two large trade unions combined. In 2004, as a protest against government policies, the GMB voted not to give money to the Labour Party for its election campaign, but to give money only to MPs whose views the union supported.