There have been plenty of Jewish Masons along the way. Heck, there are even Muslim members...Iran had its own network of lodges prior to 1979.
Yes, I know.
I was thinking of the time period and place in question which is the United States in the early 20th Century.
Jews were not welcomed in many places.
Anti-Semitism was the norm. Not violent typically but pervasive.
They frequently blackballed from many organizations.