I believe it is very much possible that the only way the vote turned out the way it did is due to threats of layoffs.
A labor group that did not secure enough votes from Amazon.com Inc warehouse workers in Alabama to form a union has formally objected to the election results and alleged the online retailer threatened to lay off staff, according to a government filing.
https://wtvbam.com/2021/04/19/union-files-objections-to-amazon-election-results-alleging-layoffs-were-threatened/