trade union
noun
WORKPLACE, HR ukus(UK also trades union); (US also labor union)an organization that represents the people who work in a particular industry, protects their rights, and agrees on pay, hours, etc. with their employers:
75% of the country's paid labour force are not members of a trade union.
The Labour party emerged from within the trade union movement.
a trade union activist/leader/member
a trade union official/representative
belong to/form/join a trade union
recognize a trade union