What about companies where different parts of the company have differing work arrangements? For instance, my telco has some union workers in specific roles, as

What about companies where different parts of the company have differing work arrangements? For instance, my telco has some union workers in specific roles, as well as non-union retail staff, and a "management professional" category. If union people were getting laid off, it would be due to the role, but of course there would be no non-union workers in that role.