What's the difference between 'union leaders' and 'union bosses'?

It's a question we pondered this month after the always insipid David Folkenflick appeared on CBS NEWS.


Folkenflick repeatedly referred to "union leader."

That's not what he's supposed to do.

Not per NPR's ethical guidelines.  As NPR's Standards & Practices editor Mark Memmot wrote:

(“Memmos;” Dec. 9, 2016)

Notes

Don’t Call Them ‘Union Bosses’ #

Unless you’re working on the script of an On The Waterfront remake, the phrase “union boss” isn’t how you should refer to the elected leader of an organization representing the interests of workers. The person’s title is good enough.

So Folkenflick should have called Chuck Jones "president of the United Steelworkers Local 1999 union."

Should have . . . but never did.

Maybe it was Folkenflick's December 9th appearance on CBS News that prompted Memmot's December 9th post?