When searching for jobs, what might a posting at a unionized facility read if the union status is not explicit?

Answer

Must be willing to join the union upon hire

Many positions in unionized environments are not advertised with the word 'union' in the title, but the posting might include a stipulation that the applicant must join the union or pay agency fees as dictated by the existing contract.

When searching for jobs, what might a posting at a unionized facility read if the union status is not explicit?
jobManufacturingUnion