a factory, business, etc. in which employees must all be members of a particular trade/labor union Wordfinderunionballot, closed shop, collective bargaining, industrial action, labour, picket, protest, representative, strike, union Culture Closed shops were made illegal in Britain in the 1980s. In the US they were made illegal by the Taft-Hartley Act of 1947, but they became legal again in 1951
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