noun
union shop
A workplace where employees must join a labor union within a certain period after being hired. This is a direct loanword from English, used in labor relations contexts.
この会社はユニオンショップ制を採用している。
This company has adopted a union shop system.
ユニオンショップでは、入社後一定期間内
In a union shop, you must join the union within a certain period after joining the company.