Keith Burris was at the center of the firing of cartoonist Rob Rogers and penned the "Reason as Racism" editorial.
Post-Gazette employees said the Saturday incident included classist insults and threats of firings.
The Post-Gazette’s publisher ‘went berserk in the newsroom.’ Now the union wants him barred from the office.
Some PG employees concerned for their safety are working from home.
The newspaper won't publish this letter, which says the work of Rob Rogers' replacement "display[s] a contempt for women and an obvious deep-seated prejudice against them."
"... On its face, it seems unusual to make fun of your customers and do it in a mocking and irreverent way."
The 12-step "guide" drew fire to the editorial board of what will soon be the city's only printed daily paper.
The Pittsburgh Post-Gazette's publisher and editor-in-chief met with Donald Trump on Wednesday, a week after Tribune-Review editors and reporters sat down with Donald Jr.