In the essay, "Our Way of Life Makes Us Miserable," what does Fromm mean when by the term "organization man"?
What Fromm is doing with this label is sort of identifying what you might call a subspecies of human beings -- he's saying that there are all these people who have been turned into (in this case) people who are totally suited to working and living in a big bureaucratized company and society.
This kind of man, Fromm says, has been completely dominated mentally, spiritually, and emotionally by the company he works for. He has no conscience of his own, no goals of his own -- all he lives for is to do what the company says or needs.
These kind of people don't have any sense of justice or independence of their own, he says, so they watch Westerns on TV so that they can feel like they, too, have the attributes of the heroes of those shows.
So when he uses this phrase, he's talking about people who have become slaves to working in big companies where they just do what they're told and have no freedom to be themselves.
This was a major critique of what life was like in the US back in the 1950s. There was even a very popular book called "The Organization Man" that made a similar critique in 1956. I assume Fromm took the phrase from that book.