Bargaining power is higher if you make a more specific group.
For example on my city emts fall under the general FD union that also includes all supervisory ranks for both ems and fd.
As a result in contract negotiations emts get screwed over the hardest due to having the least pull.
I assume a “barista” union would have the same problem where those in smaller coffee shops get screwed in favor of say the starbucks baristas or whatever group was largest in that union
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