trade union به انگلیسی
From Longman Dictionary
trade ˈunion (also trades union) noun [countable]
an organization, usually in a particular trade or profession, that represents workers, especially in meetings with employers
Example
The farm worker has himself contributed, though as often as not by leaving the industry rather than by joining a trade union
Wholesale changes took place within the management and trade union organisations, with the good going out with the bad
This was the proposal to rush punitive trade union legislation through Parliament while the strike was in progress
She was an active trade unionist and had lately been elected a shop steward