Important part:
The National Labor Relations Board was investigating whether four workers were never recalled from layoffs due to their support for the union. A decision on that case is pending, according to the union.
https://www.fox61.com/article/news/local/mcdonalds-workers-union-fight-local-franchise-corporate-offices/520-ae52e412-d6ff-48d9-8e2f-e5c42c4be971