The applicant union applied for certification in the construction industry.
A dispute arose regarding the composition of the bargaining unit.
At the vote, the applicant challenged all voters, claiming none were employed in the bargaining unit on the application date.
Later, the applicant withdrew its challenges for 35 individuals.
The intervenor argued the applicant could not change its position.
The Board held that since there was no agreement, the applicant was free to abandon its position with respect to any individual.
The Board directed a hearing to determine the status of the remaining 43 challenged individuals, requiring the responding party to select specific sites for the initial evidentiary focus.