I lived in the city where the NG, Jet, Ebony, and several catalogs were printed and mailed out. When the Unions tried to insert themselves into the workforce there, the radical unionists sabotaged the efficient workings of the printing plant. So around 2001 the printing of the magazines and catalogs was moved overseas after several serious incidents. What was the largest printing plant in the US now sits empty.
I was just reading up on the history of R.R. Donnnelley & Sons
https://en.wikipedia.org/wiki/RR_Donnelley
I took a tour, decades ago, and the complex of all the coordinating machinery to print, made a lasting impression.