edit: in the interest of being less combative I've reworded this entire comment.
The First Amendment does not apply to this situation. The First Amendment applies to restrictions to speech from the government, but provides no rights or privileges when it comes to repercussions from private entities.
>For example Amazon can't fire a employee for their race, or religion, or sexual preference.
>because Amazon can not retaliate by firing an employee for reporting workplace safety concerns.
Correct, but this isn't why they were fired.
There may be some gray area where the workers could claim protection under the NLRA if they but that really depends on additional details not provided in any of the reporting so far (such as which company policies they broke), and that has nothing to do with any constitutional rights.
The First Amendment does not apply to this situation. The First Amendment applies to restrictions to speech from the government, but provides no rights or privileges when it comes to repercussions from private entities.
>For example Amazon can't fire a employee for their race, or religion, or sexual preference. >because Amazon can not retaliate by firing an employee for reporting workplace safety concerns.
Correct, but this isn't why they were fired.
There may be some gray area where the workers could claim protection under the NLRA if they but that really depends on additional details not provided in any of the reporting so far (such as which company policies they broke), and that has nothing to do with any constitutional rights.