NLRB restores General Motors test in Lion Elastomers
The Board says the General Motors standard again governs discipline for misconduct during protected activity, which may reopen conduct policies and pending cases written to the prior rule.
According to a summary from the law firm Nutter, the National Labor Relations Board issued its decision in Lion Elastomers LLC on September 23, 2026, holding that General Motors LLC, 369 NLRB No. 127 (2020), is once again controlling Board precedent. The question at issue is how to judge employee misconduct that occurs during union or other concerted activity, which General Motors analyzes through a burden-shifting test. Nutter reports the shift means conduct and civility policies, and open discipline cases built around the standard that applied in the interim, may warrant re-review. The firm's summary is the basis for this item; the full scope of the Board's reasoning is not detailed in it.