

If you’re in a union already, that is not something that can generally be asked about by management, both at hiring or during your employment. Being in a union is not the same as being in a unionized workplace.
When employees of a store/factory/etc decide to unionize, there’s a point at which a specific larger union can be chosen to represent them (AFL-CIO, IBEW, Teamsters, etc). If successful, this is what allows for collective bargaining led by a union representative.
For me, the crazy takeaway of the article was just how high the acceptable level of lead is for toothpaste (the current FDA limit is 20,000ppb for fluoridated toothpaste).