Law360 (October 29, 2018, 7:28 PM EDT) — Employers can challenge whether unions still have majority support from the bargaining units they represent during the time period between when a collective bargaining agreement is struck and the day it takes effect, a divided National Labor Relations Board ruled Friday. By a 3-1 vote, the NLRB ruled that the head of the agency’s Minneapolis-based Region 18 office erroneously turned aside a petition filed by air compressor manufacturer Silvan Industries Inc. seeking to challenge whether Local 400 of the United Association of Plumbers, Steamfitters, and Pipefitters of the United States and Canada still had majority support to represent the company’s production and maintenance workers.