Wiktionary
n. A place of employment in which newly hired workers must join the union representing the workers within a certain period of time, typically 30 days.
WordNet
n. a company allowed to hire nonunion workers on the condition that they will join the union within a specified time
Wikipedia
A union shop is a form of a union security clause. Under this, the employer agrees to either only hire labor union members or to require that any new employees who are not already union members become members within a certain amount of time. Use of the union shop varies widely from nation to nation, depending on the level of protection given trade unions in general.
Usage examples of "union shop".
The employees earned union wages without having had to join the UAW, and on both attempts to create a union shop, supervised by the National Labor Relations Board, the powerful organization had failed to get even as much as 40 percent of the vote and gone away grumbling at the unaccustomed stupidity of the workers.
There was also opposition from the workers themselves, their natural suspicion and antagonism towards the new union shop stewards, all of them Buffaloes, all of them appointed and not elected.
After Celia Billings drops the note at Mrs Barrington-Stone's feet, Morrie reports for work that night at the Age and tells the story to Joe Bloges, his mate, the union shop steward.
It was late in the afternoon before Arnie Kott was able to procure the metal stake with his name engraved on it from the Union shop and make arrangements for a WWU 'copter to fly him to the F.
When Tommy took a job in a grocery store instead of the factory, his father breathed a small sigh of relief -- at least it was a union shop, the boy would have benefits and retirement.
He always ran a union shop and treated his men like members of his own family.
I wasnt aware this had become a union shop, Morris said mildly, and she snorted.