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Discover Ludwig"closed shop" is a correct and usable phrase in written English.
It is typically used in reference to a workplace where all employees must belong to a particular labor union. This means that the employer can only hire workers who are already members of the union, or who agree to join the union within a certain period of time after being hired. Example: "The factory has been a closed shop for over 50 years, with all employees being required to join the union upon being hired."
Dictionary
closed shop
noun
A business or industrial establishment whose employees are required to be labor union members as a precondition to employment.
Exact(57)
Closed shop No, says Kealey because science, however it is funded, is always a closed shop.
It closed shop.
Many have closed shop.
Open and closed shop.
Many scaled back or even closed shop.
Only for airline pilots - closed shop.
In 2009, with work drying up, he closed shop.
(Sanctuary, 2003) The "electronic Beatles" operate an infamously closed shop.
Similar(3)
Pieces of vital legislation behind schedule include the liberalisation of closed-shop white-collar professions.
These include reduced benefits, public-sector layoffs and the opening of closed-shop professions.
Boeing's factories are largely in closed-shop Washington state.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com