Excluding Jews was very subtle. Like excluding women. You would find that there were no Jews or women employed in certain positions, especially in banks. (Whatever happened to the alleged Jewish conspiracy in banking?) There were also not a whole lot of Italians. Maybe a few in IT.
There were quotas for college admissions too. Everybody knows. And colleges, especially in the South, asked your religion right on the application. I told my brother to write “Lutheran” on his! (It worked.)
It took longer for employers to allow women than for Italians. People of color took even longer.
Mad Men was popular because there was a lot of truth in what it depicted! Nobody used any of those words, but their actions illustrated what they believed.